problem in linux with flex

Hi,

I'm new to linux with flex,am using Eclipse 3.5 flex builder 3 installing perfectly but when i'am?creating flex application it is showin Assertion failed error.

org.eclipse.jface.util.Assert$AssertionFailedException: Assertion failed:
?at org.eclipse.jface.util.Assert.isTrue(Assert.java:179)
?at org.eclipse.jface.util.Assert.isTrue(Assert.java:164)
?at com.adobe.flexbuilder.editors.derived.editor.FlexMultiPageEditorPart.setActiveP age(FlexMultiPageEditorPart.java:569)
?at com.adobe.flexbuilder.editors.common.editor.CodeAndDesignEditor.setActivePage(C odeAndDesignEditor.java:647)
?at com.adobe.flexbuilder.editors.mxml.MXMLEditor.setActivePage(MXMLEditor.java:487 )
?at com.adobe.flexbuilder.editors.derived.editor.FlexMultiPageEditorPart.createPart Control(FlexMultiPageEditorPart.java:235)
?at com.adobe.flexbuilder.editors.common.editor.CodeAndDesignEditor.createPartContr ol(CodeAndDesignEditor.java:162)
?at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:6 62)
?at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:462)
?at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.j ava:595)
?at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
?at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePar t.java:180)
?at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(Present ablePartFolder.java:270)
?at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRig htTabOrder.java:65)
?at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(T abbedStackPresentation.java:473)
?at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1 256)
?at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209)
?at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1608)
?at org.eclipse.ui.internal.PartStack.add(PartStack.java:499)
?at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
?at org.eclipse.ui.internal.PartStack.add(PartStack.java:485)
?at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
?at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java: 63)
?at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:225)
?at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:213)
?at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:778)
?at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.ja va:677)
?at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:638)
?at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java: 2854)
?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.ui.ide.IDE.openEditor(IDE.java:651)
?at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
?at org.eclipse.ui.actions.OpenFileAction.openFile(OpenFileAction.java:99)
?at org.eclipse.ui.actions.OpenSystemEditorAction.run(OpenSystemEditorAction.java:9 9)
?at org.eclipse.ui.views.navigator.OpenActionGroup.runDefaultAction(OpenActionGroup .java:133)
?at org.eclipse.ui.views.navigator.MainActionGroup.runDefaultAction(MainActionGroup .java:330)
?at org.eclipse.ui.views.navigator.ResourceNavigator.handleOpen(ResourceNavigator.j ava:787)
?at org.eclipse.ui.views.navigator.ResourceNavigator$6.open(ResourceNavigator.java: 499)
?at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWit hEditorHelper.java:48)
?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:110 1)
?at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1 205)
?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:1176)
?at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3493)
?at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3112)
?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.jav a:113)
?at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194 )
?at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(Ecl ipseAppLauncher.java:110)
?at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLa uncher.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(NativeMethodAccessorImpl.java:39)
?at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:25)
?at java.lang.reflect.Method.invoke(Method.java:597)
?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)

am unable understand this error