HTTP ERROR 500

Problem accessing /xwiki/bin/view/Main/WebHome. Reason:

    Invalid locale format: default

Caused by:

java.lang.IllegalArgumentException: Invalid locale format: default
	at org.apache.commons.lang3.LocaleUtils.toLocale(LocaleUtils.java:105)
	at com.xpn.xwiki.XWikiContext.setLanguage(XWikiContext.java:469)
	at com.xpn.xwiki.XWiki.getLanguagePreference(XWiki.java:2339)
	at com.xpn.xwiki.doc.XWikiDocument.getTranslatedDocument(XWikiDocument.java:5412)
	at com.xpn.xwiki.api.Document.getTranslatedDocument(Document.java:595)
	at com.xpn.xwiki.render.XWikiScriptContextInitializer.initialize(XWikiScriptContextInitializer.java:100)
	at org.xwiki.script.internal.DefaultScriptContextManager.getScriptContext(DefaultScriptContextManager.java:67)
	at com.xpn.xwiki.render.DefaultVelocityManager.getVelocityContext(DefaultVelocityManager.java:90)
	at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:174)
	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(Unknown Source)

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