Problems with gwt plugin and eclipse

I am running 64 bit windows vista and for some reason I am getting
this error:
Errors occurred during the build.
Errors running builder 'Google Web Toolkit Project Validator' on
project 'contacts'.
org.eclipse.jdt.internal.core.JavaModel cannot be cast to
org.eclipse.jdt.core.IJavaProject

I have tried several versions of eclipse and and the only way I seem
to be able to create and run a standard gwt project in eclipse is by
going back to an older version of eclipse i.e Version:
3.5.0.v20090611a-9gEeG1HFtQcmRThO4O3aR_fqSMvJR2sJ
Build id: I20090611-1540

Anyone have any suggestions as I have tried every other combination of
32 and 64 bit eclipse with gwt plugin I can think of.
Thanks

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