java - Cannot assign instance of javax.swing.event.EventListenerList to field javax.swing.AncestorNotifier.firstInvisibleAncestor -


i little bit lost here. have java program runs on computers without trouble. on of them following exception thrown:

error: java.lang.classcastexception: cannot assign instance of javax.swing.event.eventlistenerlist field javax.swing.ancestornotifier.firstinvisibleancestor of type java.awt.component in instance of javax.swing.ancestornotifier

the java version seems date on machines. has clue might cause exception?


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