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This exception has no message.
java.lang.NullPointerException at SampleTrial$button1.actionPerformed(SampleTrial.java:166) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.AWTEventMulticaster.actionPerformed(Unknown Source) at java.awt.Button.processActionEvent(Unknown Source) at java.awt.Button.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)