java.lang.ClassCastException: org.eclipse.wst.sse.ui.StructuredTextEditor cannot be cast to org.eclipse.ui.part.MultiPageEditorPart

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java.lang.ClassCastException: org.eclipse.wst.sse.ui.StructuredTextEditor cannot be cast to org.eclipse.ui.part.MultiPageEditorPart
at com.springsource.sts.internal.ide.ui.actions.OpenNamespaceConfigWizardCommandHandler.execute(OpenNamespaceConfigWizardCommandHandler.java:44)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)

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