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Because you are using non standard java classes: Keyboard and Library, it is not possible for me to test the code the same way you are. When I hard code some values in the code:

ticketType =...

Can you explain what problems you are having?
Copy the contents of the console window and paste it here and add some comments describing the problems.

Please copy the full text of the error message and paste it here. It has important info about the error.