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Try asking the question here: https://coderanch.com/f/98/JavaFX
I think there are people there that know JavaFX

The JVM thinks that the call to launch at line 23 is not the first time the launch method was called. Has the code called launch before?
I guess the code can only call launch one time. (I don't...

Can you copy and post the full contents of the error message stack trace?

Also please post the import statements for the code so it can be compiled and executed for testing.