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    One of the variables you're using is set to Null or you're passing a Null value to a method expecting another kind of value

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java.lang.NullPointerException: 	at undefined.MainGUI.$$$setupUI$$$(	at undefined.MainGUI.(	at undefined.Main.main(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at com.intellij.rt.execution.application.AppMain.main(