Could not open the editor: The editor class could not be instantiated.

Yesterday FlashBuilder was automatically updated for Adobe updater and now Flashbuilder shows an error: "Could not open the editor: The editor class could not be instantiated. This usually indicates a missing no-arg constructor or that the editor's class name was mistyped in plugin.xml."
Bellow some lines of log error:
java.lang.NoClassDefFoundError: com/adobe/flexbuilder/codemodel/common/IMXMLConstants
at com.adobe.flexbuilder.mxml.editor.MXMLEditor.<init>(MXMLEditor.java:120)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java: 39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorIm pl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(Re gistryStrategyOSGI.java:170)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionR egistry.java:874)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(Configu rationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(C onfigurationElementHandle.java:51)
at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:259)
What is wrong!!!
I can't work without him!!!

Just had this problem occur as well.
All the workspaces seem to now have the Flash Player Icons on the menu. They were not there before.
If I create a new workspace, it seems to work fine until I switch to any existing workspace and then the new workspace is also affected.
I can import a project from the other workspaces, into a new workspace and that works as well.
My only mental history is that all was well. Then I spent some time writing a project in CS4 for a day without any need for Flex Builder. Then when I returned to FLex Builder the last opened project would not run and although I can get to the new project screen, the next and Finish button although enabled fail silently.
Eclipse Galieo, Flash 4 Builder Plugin.
Not sure what path to take. Remove Flex Builder plugin? Exclipse? Certain files or hidden folders?
Any suggestions where to explore would be nice.

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