Some guesses:

- Did you install FB3 directly over FB2, or over beta 1 of FB3?  That
might cause problems of this kind.

- A longshot, but try launching from the command line with
"flexbuilder -clean".  The "-clean" option will clear out various
Eclipse configuration info.  It will not destroy your workspace.

- Mike Morearty, Adobe Flex Builder team


--- In flexcoders@yahoogroups.com, Scott - FastLane <[EMAIL PROTECTED]> wrote:
>
> Tom -
> 
> Sorry, but I don't see any suggestion on the bug.  Guess I just don't 
> know where to look.  Anyway, here is the whole trace from my eclipse.
> 
> Unable to create this part due to an internal error. Reason for the 
> failure: The editor class could not be instantiated. This usually 
> indicates that the editor's class name was mistyped in plugin.xml.
> 
> Details >>>
> 
> java.lang.ClassNotFoundException: 
> com.adobe.flexbuilder.editors.mxml.MXMLEditor
>     at 
>
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:407)
>     at 
>
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:352)
>     at 
>
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>     at 
>
org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:276)
>     at 
>
org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
>     at 
>
org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1245)
>     at 
>
org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:147)
>     at 
>
org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:759)
>     at 
>
org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
>     at 
>
org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
>     at 
> org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:242)
>     at
org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
>     at 
>
org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:238)
>     at 
>
org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:231)
>     at 
> org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:908)
>     at 
>
org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:549)
>     at 
>
org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:372)
>     at 
>
org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:566)
>     at 
>
org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:214)
>     at 
>
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2588)
>     at 
>
org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2521)
>     at 
> org.eclipse.ui.internal.WorkbenchPage.access$10(WorkbenchPage.java:2513)
>     at
org.eclipse.ui.internal.WorkbenchPage$9.run(WorkbenchPage.java:2498)
>     at
org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
>     at 
>
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2493)
>     at 
>
org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2478)
>     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:388)
>     at org.eclipse.ui.ide.IDE.openEditor(IDE.java:350)
>     at 
> org.eclipse.ui.actions.OpenFileAction.openFile(OpenFileAction.java:98)
>     at 
>
org.eclipse.ui.actions.OpenSystemEditorAction.run(OpenSystemEditorAction.java:98)
>     at 
>
org.eclipse.ui.views.navigator.OpenActionGroup.runDefaultAction(OpenActionGroup.java:125)
>     at 
>
org.eclipse.ui.views.navigator.MainActionGroup.runDefaultAction(MainActionGroup.java:328)
>     at 
>
org.eclipse.ui.views.navigator.ResourceNavigator.handleOpen(ResourceNavigator.java:679)
>     at 
>
org.eclipse.ui.views.navigator.ResourceNavigator$6.open(ResourceNavigator.java:434)
>     at 
>
org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:817)
>     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
>     at org.eclipse.core.runtime.Platform.run(Platform.java:843)
>     at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44)
>     at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:149)
>     at 
>
org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:815)
>     at 
>
org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1069)
>     at 
>
org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1168)
>     at 
> org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:249)
>     at
org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:243)
>     at 
> org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:283)
>     at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
>     at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928)
>     at
org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348)
>     at
org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968)
>     at
org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914)
>     at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878)
>     at 
>
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419)
>     at
org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
>     at 
> org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95)
>     at 
>
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78)
>     at 
>
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92)
>     at 
>
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68)
>     at 
>
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
>     at 
>
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177)
>     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:585)
>     at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336)
>     at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
>     at org.eclipse.core.launcher.Main.run(Main.java:977)
>     at org.eclipse.core.launcher.Main.main(Main.java:952)
> 
> 
> Thanks
> Scott
> 
> Tom Chiverton wrote:
> > On Thursday 04 Oct 2007, [EMAIL PROTECTED] wrote:
> >   
> >> Does anybody know what causes this issue
> >> http://bugs.adobe.com/jira/browse/FB-8390, and if there is any
way I can
> >> get around it?  My MXML editor worked fine yesterday (or maybe
the day
> >>     
> >
> > As suggested on the bug, what's the rest of the log say ?
> >
> >
>


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