I'm trying to refactor a package name (pretty near the root of the project hierarchy), and I'm getting the following error (flash builder 4):

A fatal error occurred while performing the refactoring

An unexpected exception occurred while creating a change object.  See the error log for more details.

The log file looks like this....

!ENTRY org.eclipse.ltk.ui.refactoring 4 10000 2010-09-30 10:57:25.134
!MESSAGE Internal Error
!STACK 0
java.lang.reflect.InvocationTargetException
    at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:421)
    at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.run(RefactoringWizardDialog2.java:330)
    at org.eclipse.ltk.ui.refactoring.RefactoringWizard.createChange(RefactoringWizard.java:583)
    at org.eclipse.ltk.ui.refactoring.RefactoringWizard.computeUserInputSuccessorPage(RefactoringWizard.java:422)
    at org.eclipse.ltk.ui.refactoring.UserInputWizardPage.computeSuccessorPage(UserInputWizardPage.java:74)
    at org.eclipse.ltk.ui.refactoring.UserInputWizardPage.getNextPage(UserInputWizardPage.java:114)
    at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.nextOrPreviewPressed(RefactoringWizardDialog2.java:495)
    at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.access$2(RefactoringWizardDialog2.java:492)
    at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2$1.widgetSelected(RefactoringWizardDialog2.java:691)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
    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:3880)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
    at org.eclipse.jface.window.Window.open(Window.java
apache-flex eclipse refactoring
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