Installing extensions - extension manager - could not save error

Exception thrown during job execution
class org.xwiki.extension.repository.LocalExtensionRepositoryException: Failed to save extensoin [coldserenity:tabs-macro-1.0.1] descriptor
    at org.xwiki.extension.repository.internal.local.DefaultLocalExtensionRepository.storeExtension(DefaultLocalExtensionRepository.java:275)
    at org.xwiki.extension.job.internal.InstallJob.storeExtension(InstallJob.java:193)
    at org.xwiki.extension.job.internal.InstallJob.store(InstallJob.java:182)
    at org.xwiki.extension.job.internal.InstallJob.start(InstallJob.java:144)
    at org.xwiki.job.AbstractJob.start(AbstractJob.java:120)
    at org.xwiki.job.internal.DefaultJobManager.executeJob(DefaultJobManager.java:171)
    at org.xwiki.extension.script.internal.ExtensionManagerScriptService.install(ExtensionManagerScriptService.java:398)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
    at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
    at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
    at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
    at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
    at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:124)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:50)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.evaluateBlock(AbstractScriptMacro.java:302)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:198)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:59)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transformOnce(MacroTransformation.java:188)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:133)
    at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:83)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:248)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:124)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:54)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:118)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:57)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:911)
    at com.xpn.xwiki.XWiki.getRenderedContent(XWiki.java:4269)
    at com.xpn.xwiki.XWiki.include(XWiki.java:4184)
    at com.xpn.xwiki.api.XWiki.includeForm(XWiki.java:1631)
    at com.xpn.xwiki.api.XWiki.includeForm(XWiki.java:1591)
    at sun.reflect.GeneratedMethodAccessor353.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
    at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
    at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
    at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTElseIfStatement.render(ASTElseIfStatement.java:92)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:124)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:50)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.evaluateBlock(AbstractScriptMacro.java:302)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:198)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:59)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transformOnce(MacroTransformation.java:188)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:133)
    at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:83)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:248)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:124)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:54)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:118)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:57)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:911)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:890)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:921)
    at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:582)
    at sun.reflect.GeneratedMethodAccessor323.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
    at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
    at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
    at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
    at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:105)
    at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791)
    at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:155)
    at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:241)
    at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352)
    at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:120)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:476)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:517)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:937)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:871)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
    at org.eclipse.jetty.server.Server.handle(Server.java:346)
    at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589)
    at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1048)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:601)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:214)
    at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:535)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529)
    at java.lang.Thread.run(Thread.java:679)
Caused by: class java.io.IOException: Invalid answer (500) fo the server when requesting
    at org.xwiki.extension.repository.xwiki.internal.XWikiExtensionRepository.getRESTResource(XWikiExtensionRepository.java:125)
    at org.xwiki.extension.repository.xwiki.internal.XWikiExtensionRepository.getRESTResourceAsStream(XWikiExtensionRepository.java:134)
    at org.xwiki.extension.repository.xwiki.internal.XWikiExtensionFile.openStream(XWikiExtensionFile.java:76)
    at org.xwiki.extension.repository.internal.local.DefaultLocalExtensionRepository.storeExtension(DefaultLocalExtensionRepository.java:262)
    at org.xwiki.extension.job.internal.InstallJob.storeExtension(InstallJob.java:193)
    at org.xwiki.extension.job.internal.InstallJob.store(InstallJob.java:182)
    at org.xwiki.extension.job.internal.InstallJob.start(InstallJob.java:144)
    at org.xwiki.job.AbstractJob.start(AbstractJob.java:120)
    at org.xwiki.job.internal.DefaultJobManager.executeJob(DefaultJobManager.java:171)
    at org.xwiki.extension.script.internal.ExtensionManagerScriptService.install(ExtensionManagerScriptService.java:398)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
    at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
    at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
    at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
    at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
    at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:124)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:50)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.evaluateBlock(AbstractScriptMacro.java:302)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:198)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:59)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transformOnce(MacroTransformation.java:188)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:133)
    at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:83)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:248)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:124)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:54)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:118)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:57)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:911)
    at com.xpn.xwiki.XWiki.getRenderedContent(XWiki.java:4269)
    at com.xpn.xwiki.XWiki.include(XWiki.java:4184)
    at com.xpn.xwiki.api.XWiki.includeForm(XWiki.java:1631)
    at com.xpn.xwiki.api.XWiki.includeForm(XWiki.java:1591)
    at sun.reflect.GeneratedMethodAccessor353.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
    at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
    at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
    at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:216)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:311)
    at org.apache.velocity.runtime.directive.RuntimeMacro.render(RuntimeMacro.java:230)
    at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:207)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTElseIfStatement.render(ASTElseIfStatement.java:92)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:124)
    at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:50)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.evaluateBlock(AbstractScriptMacro.java:302)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:198)
    at org.xwiki.rendering.macro.script.AbstractScriptMacro.execute(AbstractScriptMacro.java:59)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transformOnce(MacroTransformation.java:188)
    at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:133)
    at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:83)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:248)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:124)
    at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:54)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:80)
    at org.xwiki.display.internal.DefaultDocumentDisplayer.display(DefaultDocumentDisplayer.java:38)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:118)
    at com.xpn.xwiki.internal.sheet.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:57)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)
    at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:911)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:890)
    at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:921)
    at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:582)
    at sun.reflect.GeneratedMethodAccessor323.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
    at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
    at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
    at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
    at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:369)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:87)
    at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
    at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
    at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
    at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:105)
    at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791)
    at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:155)
    at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:241)
    at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:116)
    at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
    at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
    at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
    at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:538)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1352)
    at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:120)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1323)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:476)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:517)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:225)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:937)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:406)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:183)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:871)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
    at org.eclipse.jetty.server.Server.handle(Server.java:346)
    at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:589)
    at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1048)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:601)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:214)
    at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:535)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:40)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:529)
    at java.lang.Thread.run(Thread.java:679)