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via Oracle Community by 807592, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at undefined.mainPipe3.stepButtonMouseClicked(	at undefined.mainPipe3.access$100(	at undefined.mainPipe3$2.mouseClicked(	at java.awt.AWTEventMulticaster.mouseClicked(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)