SystemAction.get method not found

Thank you for additional ideas.  The problem is now solved.  :D 

I first tried, but it did not help, uninstalling all versions of NetBeans and deleting their associated personal folders.

What finally solved the problem was to delete my project folders altogether and check them out fresh from the repository.  Previously, I had only updated from the repository, and apparently that left some residue from prior builds with earlier versions of NetBeans.

Thank you all for the suggestions.