>          When I clicked on a button twice am getting error floating point
> Exception and application got closed. Why it is happening????
>           In the callback of button am clearing clearing thr current
> window
> and opening another window.


No idea. 

Show us some minimal, compileable, code that exhibits the fault so that we can 
investigate.


Probably closing the first window in the button callback is the problem, if 
that is what you are doing, since that may leave unreferenced widgets.

This is discussed in the documents, including approaches that allow this to be 
done safely, so make sure you have followed that advice properly.








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