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Problem with java.lang.IllegalStateException: Cannot set modality once stage has been set visible

 
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Hello guys , im having an issue : when i click a menuItem it shows a window who says that "are you sure you want to logout" , and i click no (so that window is closed), but when i click again i that menuItem it shows me java.lang.IllegalStateException: Cannot set modality once stage has been set visible.

What should I do ?

Here's the code:

MainWindowController.java



Here's the method to close that window if user click "NO" i dont want to logout


OUTPUT:


MainWindowController.java.43 line is this one:
 
Ertan Hasani
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All i needed to do was to split setup(initialize) and control (logoutWindow) :

 
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