cant open gwt web project

hi

i am getting this error message,while i try to open a new gwt web project,please let me know if anyone has solution.

Plug-in com.google.gdt.eclipse.suite was unable to load class com.google.gdt.eclipse.suite.wizards.NewWebAppProjectWizard.

An error occurred while automatically activating bundle com.google.gdt.eclipse.suite (947).

thank you 

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