Uitable Handles -- Different problem

Hello

I have different problem, I defined uitable in a function with declearing the handles as global object, when I try to use the uitable handle in other function the gui window will open and error

error message Error using handle.handle/get Invalid or deleted object.

will occur but if I run the same program second time with previous GUI window opened their is no error. It looks surprise to me. pls help me.