"duplicate definition of class x"

I moved a class from one directory to another. Now JDev 3.0 gives me the error "Duplicate definition of class x".
I've tried rebuild. I've tried deleteing all the class files. I've tried exiting JDev and restart it.
I still get the error. How do I get rid of this error?

I can compile just the class x with no problem. When I do a make or rebuild of the project, then the problem happens.

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