Jboss Developer Studio: ERROR beim lesen von xhtml Dateien

Hallo,
ich verwende das JBoss Developer Studio in der Version 7.1.1 GA. Seit neuestem kommt immer öfters wenn ich zwischen den geöffneten Tabs wechsle (nur bei xhtml Seiten) einfach eine weiße Seite mit dem Text “Error” anstatt den Code anzuzeigen. Ist ziemlich nervig beim Arbeiten, schon überhaupt wenn es alle 2 min mindestens 1 mal auftritt :suspect:

Folgendermaßen sieht der Eclipse log bei solch einem Error aus:
[SPOILER]
!ENTRY org.eclipse.jst.jsf.core 4 0 2014-04-03 13:25:50.859
!MESSAGE Error creating base name for: messages
!STACK 0
java.io.IOException: Bundle messages not found in classpath for project: tis-ui
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSource.createCachedBundleFile(ResourceBundleMapSource.java:235)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSource.(ResourceBundleMapSource.java:253)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSourceFactory.getResourceBundleMapSource(ResourceBundleMapSourceFactory.java:44)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleSymbolSourceProvider.createSymbolForResourceBundle(ResourceBundleSymbolSourceProvider.java:114)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleSymbolSourceProvider.getSymbols(ResourceBundleSymbolSourceProvider.java:86)
at org.eclipse.jst.jsf.designtime.context.DTJSPExternalContext.doGetMapForScope(DTJSPExternalContext.java:87)
at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getMapForScope(AbstractDTExternalContext.java:46)
at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getRequestMap(AbstractDTExternalContext.java:64)
at org.eclipse.jst.jsf.designtime.el.DefaultDTVariableResolver.resolveVariable(DefaultDTVariableResolver.java:67)
at org.eclipse.jst.jsf.designtime.internal.symbols.ConfigBasedDTVariableResolver.resolveVariable(ConfigBasedDTVariableResolver.java:108)
at org.eclipse.jst.jsf.designtime.resolver.SymbolContextResolver.getVariable(SymbolContextResolver.java:61)
at org.eclipse.jst.jsf.core.internal.contentassist.el.SymbolResolveUtil.getSymbolForVariableSuffixExpr(SymbolResolveUtil.java:90)
at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser$PrefixVisitor.getSymbolInfo(ContentAssistParser.java:185)
at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser.getSymbolInfo(ContentAssistParser.java:83)
at org.eclipse.jst.jsf.ui.internal.jspeditor.JSPSourceUtil.determineSymbolInfo(JSPSourceUtil.java:103)
at org.eclipse.jst.jsf.ui.internal.jspeditor.AbstractELHyperlinkDetector.detectHyperlinks(AbstractELHyperlinkDetector.java:68)
at org.eclipse.jst.jsf.ui.internal.jspeditor.AbstractELHyperlinkDetector.detectHyperlinks(AbstractELHyperlinkDetector.java:55)
at org.eclipse.ui.texteditor.HyperlinkDetectorRegistry$HyperlinkDetectorDelegate.detectHyperlinks(HyperlinkDetectorRegistry.java:80)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.findHyperlinks(HyperlinkManager.java:289)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.findHyperlinks(HyperlinkManager.java:261)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.mouseMove(HyperlinkManager.java:469)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:212)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
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:606)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)

!ENTRY org.eclipse.jst.jsf.core 4 0 2014-04-03 13:25:50.876
!MESSAGE Error creating base name for: messages
!STACK 0
java.io.IOException: Bundle messages not found in classpath for project: tis-ui
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSource.createCachedBundleFile(ResourceBundleMapSource.java:235)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSource.(ResourceBundleMapSource.java:253)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSourceFactory.getResourceBundleMapSource(ResourceBundleMapSourceFactory.java:44)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleSymbolSourceProvider.createSymbolForResourceBundle(ResourceBundleSymbolSourceProvider.java:114)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleSymbolSourceProvider.getSymbols(ResourceBundleSymbolSourceProvider.java:86)
at org.eclipse.jst.jsf.designtime.context.DTJSPExternalContext.doGetMapForScope(DTJSPExternalContext.java:87)
at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getMapForScope(AbstractDTExternalContext.java:46)
at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getSessionMap(AbstractDTExternalContext.java:72)
at org.eclipse.jst.jsf.designtime.el.DefaultDTVariableResolver.resolveVariable(DefaultDTVariableResolver.java:72)
at org.eclipse.jst.jsf.designtime.internal.symbols.ConfigBasedDTVariableResolver.resolveVariable(ConfigBasedDTVariableResolver.java:108)
at org.eclipse.jst.jsf.designtime.resolver.SymbolContextResolver.getVariable(SymbolContextResolver.java:61)
at org.eclipse.jst.jsf.core.internal.contentassist.el.SymbolResolveUtil.getSymbolForVariableSuffixExpr(SymbolResolveUtil.java:90)
at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser$PrefixVisitor.getSymbolInfo(ContentAssistParser.java:185)
at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser.getSymbolInfo(ContentAssistParser.java:83)
at org.eclipse.jst.jsf.ui.internal.jspeditor.JSPSourceUtil.determineSymbolInfo(JSPSourceUtil.java:103)
at org.eclipse.jst.jsf.ui.internal.jspeditor.AbstractELHyperlinkDetector.detectHyperlinks(AbstractELHyperlinkDetector.java:68)
at org.eclipse.jst.jsf.ui.internal.jspeditor.AbstractELHyperlinkDetector.detectHyperlinks(AbstractELHyperlinkDetector.java:55)
at org.eclipse.ui.texteditor.HyperlinkDetectorRegistry$HyperlinkDetectorDelegate.detectHyperlinks(HyperlinkDetectorRegistry.java:80)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.findHyperlinks(HyperlinkManager.java:289)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.findHyperlinks(HyperlinkManager.java:261)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.mouseMove(HyperlinkManager.java:469)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:212)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
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:606)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)

!ENTRY org.eclipse.jst.jsf.core 4 0 2014-04-03 13:25:50.892
!MESSAGE Error creating base name for: messages
!STACK 0
java.io.IOException: Bundle messages not found in classpath for project: tis-ui
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSource.createCachedBundleFile(ResourceBundleMapSource.java:235)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSource.(ResourceBundleMapSource.java:253)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleMapSourceFactory.getResourceBundleMapSource(ResourceBundleMapSourceFactory.java:44)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleSymbolSourceProvider.createSymbolForResourceBundle(ResourceBundleSymbolSourceProvider.java:114)
at org.eclipse.jst.jsf.designtime.internal.symbols.ResourceBundleSymbolSourceProvider.getSymbols(ResourceBundleSymbolSourceProvider.java:86)
at org.eclipse.jst.jsf.designtime.context.DTJSPExternalContext.doGetMapForScope(DTJSPExternalContext.java:87)
at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getMapForScope(AbstractDTExternalContext.java:46)
at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getApplicationMap(AbstractDTExternalContext.java:80)
at org.eclipse.jst.jsf.designtime.el.DefaultDTVariableResolver.resolveVariable(DefaultDTVariableResolver.java:77)
at org.eclipse.jst.jsf.designtime.internal.symbols.ConfigBasedDTVariableResolver.resolveVariable(ConfigBasedDTVariableResolver.java:108)
at org.eclipse.jst.jsf.designtime.resolver.SymbolContextResolver.getVariable(SymbolContextResolver.java:61)
at org.eclipse.jst.jsf.core.internal.contentassist.el.SymbolResolveUtil.getSymbolForVariableSuffixExpr(SymbolResolveUtil.java:90)
at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser$PrefixVisitor.getSymbolInfo(ContentAssistParser.java:185)
at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser.getSymbolInfo(ContentAssistParser.java:83)
at org.eclipse.jst.jsf.ui.internal.jspeditor.JSPSourceUtil.determineSymbolInfo(JSPSourceUtil.java:103)
at org.eclipse.jst.jsf.ui.internal.jspeditor.AbstractELHyperlinkDetector.detectHyperlinks(AbstractELHyperlinkDetector.java:68)
at org.eclipse.jst.jsf.ui.internal.jspeditor.AbstractELHyperlinkDetector.detectHyperlinks(AbstractELHyperlinkDetector.java:55)
at org.eclipse.ui.texteditor.HyperlinkDetectorRegistry$HyperlinkDetectorDelegate.detectHyperlinks(HyperlinkDetectorRegistry.java:80)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.findHyperlinks(HyperlinkManager.java:289)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.findHyperlinks(HyperlinkManager.java:261)
at org.eclipse.jface.text.hyperlink.HyperlinkManager.mouseMove(HyperlinkManager.java:469)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:212)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:140)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:611)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
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:606)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
[/SPOILER]

bin leider etwas am verzweifeln, da ich mit dem nicht wirklich was anzufangen weiß, hat einer eine Idee?

Beste Grüße