Markdown rendering error under load

<h1 class="gadget-title wikigeneratedheader"><span>Activity Stream</span></h1><div class="gadget-content"><div class="xwikirenderingerror">Failed to execute the [velocity] macro</div><div class="xwikirenderingerrordescription hidden"><pre>org.xwiki.rendering.macro.MacroExecutionException: Failed to evaluate Velocity Macro for content [#set ($displayUI = true)
#handleMessageAction($displayUI)
#if ($displayUI)
  &#123;&#123;html}}
  &lt;div class='activity'&gt;
    #initDateVariables()
    #addStateHiddenInput()
    #displayActivity()
  &lt;/div&gt;
  &#123;&#123;/html}}
#end]
	at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:131)
	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:135)
	at org.xwiki.rendering.internal.macro.wikibridge.DefaultWikiMacro.execute(DefaultWikiMacro.java:224)
	at org.xwiki.rendering.internal.macro.wikibridge.DefaultWikiMacro.execute(DefaultWikiMacro.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:135)
	at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:84)
	at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:250)
	at org.xwiki.display.internal.DocumentContentDisplayer.displayInIsolatedExecutionContext(DocumentContentDisplayer.java:217)
	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 org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:113)
	at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50)
	at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:67)
	at org.xwiki.display.internal.ConfiguredDocumentDisplayer.display(ConfiguredDocumentDisplayer.java:41)
	at org.xwiki.rendering.internal.macro.include.IncludeMacro.execute(IncludeMacro.java:168)
	at org.xwiki.rendering.internal.macro.include.IncludeMacro.execute(IncludeMacro.java:55)
	at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transformOnce(MacroTransformation.java:188)
	at org.xwiki.rendering.internal.transformation.macro.MacroTransformation.transform(MacroTransformation.java:135)
	at org.xwiki.rendering.internal.transformation.DefaultTransformationManager.performTransformations(DefaultTransformationManager.java:84)
	at org.xwiki.display.internal.DocumentContentDisplayer.display(DocumentContentDisplayer.java:250)
	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 org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:113)
	at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50)
	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:901)
	at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:880)
	at com.xpn.xwiki.doc.XWikiDocument.getRenderedContent(XWikiDocument.java:911)
	at com.xpn.xwiki.api.Document.getRenderedContent(Document.java:603)
	at sun.reflect.GeneratedMethodAccessor290.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:395)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:384)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:173)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:280)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:567)
	at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:71)
	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:142)
	at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:106)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:342)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
	at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:105)
	at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1765)
	at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1705)
	at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:854)
	at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.velocity.util.introspection.UberspectImpl$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.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:1765)
	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:680)
Caused by: org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content with id [unknown namespace]
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:243)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:184)
	at org.xwiki.rendering.internal.macro.velocity.VelocityMacro.evaluateString(VelocityMacro.java:124)
	... 125 more
Caused by: org.apache.velocity.exception.MethodInvocationException: Invocation of method 'getDisplayTitle' in  class com.xpn.xwiki.api.Document threw exception org.parboiled.errors.ParserRuntimeException: Error while parsing action 'Root/Sequence/ZeroOrMore/Sequence/Block/FirstOf/Heading/FirstOf/AtxHeading/OneOrMore/Sequence/AtxHeading_Action1' at input position (line 1, pos 10):
## Errata
         ^

java.lang.ClassCastException at unknown namespace[line 677, column 57]
	at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:223)
	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.SimpleNode.render(SimpleNode.java:342)
	at org.apache.velocity.runtime.parser.node.ASTStringLiteral.value(ASTStringLiteral.java:330)
	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.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.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.Foreach.render(Foreach.java:420)
	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.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.Foreach.render(Foreach.java:420)
	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.SimpleNode.render(SimpleNode.java:342)
	at org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVelocityEngine.java:224)
	... 127 more
Caused by: org.parboiled.errors.ParserRuntimeException: Error while parsing action 'Root/Sequence/ZeroOrMore/Sequence/Block/FirstOf/Heading/FirstOf/AtxHeading/OneOrMore/Sequence/AtxHeading_Action1' at input position (line 1, pos 10):
## Errata
         ^

java.lang.ClassCastException
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:345)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.OneOrMoreMatcher.match(OneOrMoreMatcher.java:38)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.FirstOfMatcher.match(FirstOfMatcher.java:41)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.FirstOfMatcher.match(FirstOfMatcher.java:41)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.ZeroOrMoreMatcher.match(ZeroOrMoreMatcher.java:39)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46)
	at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77)
	at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:330)
	at org.parboiled.parserunners.BasicParseRunner.run(BasicParseRunner.java:72)
	at org.parboiled.parserunners.ReportingParseRunner.runBasicMatch(ReportingParseRunner.java:86)
	at org.parboiled.parserunners.ReportingParseRunner.run(ReportingParseRunner.java:66)
	at org.parboiled.parserunners.AbstractParseRunner.run(AbstractParseRunner.java:81)
	at org.pegdown.Parser.parseToParsingResult(Parser.java:1284)
	at org.pegdown.Parser.parseInternal(Parser.java:1272)
	at org.pegdown.Parser.parse(Parser.java:76)
	at org.pegdown.PegDownProcessor.parseMarkdown(PegDownProcessor.java:88)
	at org.xwiki.rendering.internal.parser.markdown.MarkdownParser.parse(MarkdownParser.java:80)
	at com.xpn.xwiki.doc.XWikiDocument.parseContent(XWikiDocument.java:7677)
	at com.xpn.xwiki.doc.XWikiDocument.parseContent(XWikiDocument.java:7666)
	at com.xpn.xwiki.doc.XWikiDocument.getXDOM(XWikiDocument.java:7493)
	at com.xpn.xwiki.doc.XWikiDocument.getDefaultEditMode(XWikiDocument.java:6065)
	at com.xpn.xwiki.internal.sheet.DefaultModelBridge.getDefaultEditMode(DefaultModelBridge.java:80)
	at org.xwiki.sheet.internal.SheetDocumentDisplayer.isSheetExpected(SheetDocumentDisplayer.java:138)
	at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:93)
	at org.xwiki.sheet.internal.SheetDocumentDisplayer.display(SheetDocumentDisplayer.java:50)
	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.getRenderedTitle(XWikiDocument.java:1172)
	at com.xpn.xwiki.api.Document.getDisplayTitle(Document.java:316)
	at sun.reflect.GeneratedMethodAccessor145.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.velocity.runtime.parser.node.PropertyExecutor.execute(PropertyExecutor.java:142)
	at org.apache.velocity.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:539)
	at org.apache.velocity.runtime.parser.node.ASTIdentifier.execute(ASTIdentifier.java:198)
	... 170 more
Caused by: java.lang.ClassCastException
</pre></div></div></div></div><div class="clearfloats"></div></div></div>
</div>