debugging problems

I'm trying to remote debug a project
but from some reason the inteliJ doesn't let debug
a class. the class is in the project class path but it doesn't
show the red point with V on it when I try to define a break point in the class , the red point remains without a V sign . how can I put a break point in that class ?
I can put break points in other classes without a problem
tx in advance

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