(Nightly build, Scala IDE for Eclipse 1.0.0.201009070003 org.scala-ide.sdt.feature.feature.group)

I get this Error after in a Team Synchronize perspective, when comparing local *.scala files with latest versions from our SVN repository (using Subversive plugin)

null
Error
Tue Sep 07 13:29:54 EEST 2010
Problems occurred when invoking code from plug-in: "org.eclipse.jface".

java.lang.AssertionError: assertion failed: bad position: [-1:-2]
at scala.Predef$.assert(Predef.scala:91)
at scala.tools.nsc.util.RangePosition.<init>(Position.scala:238)
at scala.tools.refactoring.common.Selections$FileSelection.pos(Selections.scala:103)
at scala.tools.refactoring.common.Selections$Selection$class.contains(Selections.scala:57)
at scala.tools.refactoring.common.Selections$FileSelection.contains(Selections.scala:101)
at scala.tools.refactoring.common.Selections$Selection$$anonfun$selectedSymbolTree$1$$anonfun$apply$1.apply(Selections.scala:69)
at scala.tools.refactoring.common.Selections$Selection$$anonfun$selectedSymbolTree$1$$anonfun$apply$1.apply(Selections.scala:69)
at scala.PartialFunction$.cond(PartialFunction.scala:95)
at scala.tools.refactoring.common.Selections$Selection$$anonfun$selectedSymbolTree$1.apply(Selections.scala:69)
at scala.tools.refactoring.common.Selections$Selection$$anonfun$selectedSymbolTree$1.apply(Selections.scala:69)
at scala.tools.nsc.ast.Trees$FilterTreeTraverser.traverse(Trees.scala:1017)
at scala.tools.nsc.ast.Trees$TreeOps.filter(Trees.scala:66)
at scala.tools.refactoring.common.Selections$Selection$class.selectedSymbolTree(Selections.scala:69)
at scala.tools.refactoring.common.Selections$FileSelection.selectedSymbolTree(Selections.scala:101)
at scala.tools.eclipse.markoccurrences.ScalaOccurrencesFinder$$anonfun$findOccurrences$1.apply(ScalaOccurrencesFinder.scala:26)
at scala.tools.eclipse.markoccurrences.ScalaOccurrencesFinder$$anonfun$findOccurrences$1.apply(ScalaOccurrencesFinder.scala:19)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply$mcV$sp(Cached.scala:22)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$class.locked(Cached.scala:83)
at scala.tools.eclipse.util.Cached$class.apply(Cached.scala:20)
at scala.tools.eclipse.ScalaPresentationCompiler$CachedCompilerResult.apply(ScalaPresentationCompiler.scala:66)
at scala.tools.eclipse.ScalaPresentationCompiler.withCompilerResult(ScalaPresentationCompiler.scala:89)
at scala.tools.eclipse.ScalaProject$$anonfun$withCompilerResult$1.apply(ScalaProject.scala:368)
at scala.tools.eclipse.ScalaProject$$anonfun$withCompilerResult$1.apply(ScalaProject.scala:367)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply$mcV$sp(Cached.scala:22)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$$anonfun$apply$1.apply(Cached.scala:21)
at scala.tools.eclipse.util.Cached$class.locked(Cached.scala:83)
at scala.tools.eclipse.util.Cached$class.apply(Cached.scala:20)
at scala.tools.eclipse.ScalaProject$$anon$1.apply(ScalaProject.scala:39)
at scala.tools.eclipse.ScalaProject.withPresentationCompiler(ScalaProject.scala:363)
at scala.tools.eclipse.ScalaProject.withCompilerResult(ScalaProject.scala:367)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$withCompilerResult$1.apply(ScalaCompilationUnit.scala:49)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.withDocument(ScalaCompilationUnit.scala:41)
at scala.tools.eclipse.javaelements.ScalaSourceFile.withDocument(ScalaSourceFile.scala:40)
at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.withCompilerResult(ScalaCompilationUnit.scala:49)
at scala.tools.eclipse.javaelements.ScalaSourceFile.withCompilerResult(ScalaSourceFile.scala:40)
at scala.tools.eclipse.markoccurrences.ScalaOccurrencesFinder.findOccurrences(ScalaOccurrencesFinder.scala:19)
at scala.tools.eclipse.ScalaSourceFileEditor.getAnnotations(ScalaSourceFileEditor.scala:111)
at scala.tools.eclipse.ScalaSourceFileEditor.updateOccurrenceAnnotations(ScalaSourceFileEditor.scala:99)
at scala.tools.eclipse.ScalaSourceFileEditor$$anon$1.selectionChanged(ScalaSourceFileEditor.scala:134)
at org.eclipse.ui.internal.AbstractSelectionService.firePostSelection(AbstractSelectionService.java:179)
at org.eclipse.ui.internal.AbstractSelectionService.setActivePart(AbstractSelectionService.java:289)
at org.eclipse.ui.internal.WorkbenchPagePartList.fireActivePartChanged(WorkbenchPagePartList.java:60)
at org.eclipse.ui.internal.PartList.setActivePart(PartList.java:136)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3531)
at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:614)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2869)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2676)
at org.eclipse.compare.internal.CompareUIPlugin$1.run(CompareUIPlugin.java:518)
at org.eclipse.compare.internal.CompareUIPlugin.syncExec(CompareUIPlugin.java:1258)
at org.eclipse.compare.internal.CompareUIPlugin.internalOpenEditor(CompareUIPlugin.java:529)
at org.eclipse.compare.internal.CompareUIPlugin.openEditorInBackground(CompareUIPlugin.java:499)
at org.eclipse.compare.internal.CompareUIPlugin.openCompareEditor(CompareUIPlugin.java:488)
at org.eclipse.compare.CompareUI.openCompareEditorOnPage(CompareUI.java:168)
at org.eclipse.compare.CompareUI.openCompareEditorOnPage(CompareUI.java:149)
at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.openCompareEditor(OpenInCompareAction.java:209)
at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.openCompareEditor(OpenInCompareAction.java:169)
at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.openCompareEditor(OpenInCompareAction.java:113)
at org.eclipse.team.internal.ui.synchronize.actions.OpenInCompareAction.run(OpenInCompareAction.java:65)
at org.eclipse.team.ui.synchronize.ModelSynchronizeParticipantActionGroup$1.run(ModelSynchronizeParticipantActionGroup.java:103)
at org.eclipse.team.internal.ui.synchronize.StructuredViewerAdvisor.handleOpen(StructuredViewerAdvisor.java:171)
at org.eclipse.team.internal.ui.synchronize.StructuredViewerAdvisor.access$0(StructuredViewerAdvisor.java:167)
at org.eclipse.team.internal.ui.synchronize.StructuredViewerAdvisor$3.open(StructuredViewerAdvisor.java:131)
at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:842)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:840)
at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1101)
at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:467)
at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1205)
at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3910)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3503)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
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:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)