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via Oracle Community by 807592, 1 year ago
This exception has no message.
java.lang.NullPointerException at mainPipe3.stepButtonMouseClicked(mainPipe3.java:866) at mainPipe3.access$100(mainPipe3.java:15) at mainPipe3$2.mouseClicked(mainPipe3.java:710) 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)