Hello,
I have just installed Eclipse with the Flex plugin and am getting an
error at the point when the editor should begin creating a new
document. Any help in determining what might be causing this, or
whether I should reinstall would be appreciated.

Here are the details that it shows:

org.eclipse.jface.util.Assert$AssertionFailedException: Assertion failed: 
        at org.eclipse.jface.util.Assert.isTrue(Assert.java:185)
        at org.eclipse.jface.util.Assert.isTrue(Assert.java:170)
        at
com.adobe.flexbuilder.editors.derived.editor.FlexMultiPageEditorPart.setActivePage(FlexMultiPageEditorPart.java:569)
        at
com.adobe.flexbuilder.editors.common.editor.CodeAndDesignEditor.setActivePage(CodeAndDesignEditor.java:643)
        at
com.adobe.flexbuilder.editors.mxml.MXMLEditor.setActivePage(MXMLEditor.java:483)
        at
com.adobe.flexbuilder.editors.derived.editor.FlexMultiPageEditorPart.createPartControl(FlexMultiPageEditorPart.java:235)
        at
com.adobe.flexbuilder.editors.common.editor.CodeAndDesignEditor.createPartControl(CodeAndDesignEditor.java:162)
        at
org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661)
        at
org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:428)
        at
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:594)
        at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:306)
        at
org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)
        at
org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)
        at
org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
        at
org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)
        at
org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)
        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:217)
        at
org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207)
        at
org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:779)
        at
org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:678)
        at
org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:639)
        at
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2817)
        at
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2729)
        at
org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2721)
        at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2673)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
        at
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2668)
        at
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2652)
        at
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2643)
        at org.eclipse.ui.ide.IDE.openEditor(IDE.java:646)
        at org.eclipse.ui.ide.IDE.openEditor(IDE.java:605)
        at 
org.eclipse.ui.actions.OpenFileAction.openFile(OpenFileAction.java:99)
        at
org.eclipse.ui.actions.OpenSystemEditorAction.run(OpenSystemEditorAction.java:99)
        at
org.eclipse.ui.views.navigator.OpenActionGroup.runDefaultAction(OpenActionGroup.java:125)
        at
org.eclipse.ui.views.navigator.MainActionGroup.runDefaultAction(MainActionGroup.java:329)
        at
org.eclipse.ui.views.navigator.ResourceNavigator.handleOpen(ResourceNavigator.java:716)
        at
org.eclipse.ui.views.navigator.ResourceNavigator$6.open(ResourceNavigator.java:443)
        at
org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
        at org.eclipse.core.runtime.Platform.run(Platform.java:880)
        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:818)
        at
org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079)
        at
org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183)
        at
org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263)
        at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257)
        at
org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:297)
        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:3823)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
        at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
        at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
        at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
        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:193)
        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:382)
        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.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1236)


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