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This exception has no message.
java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(BasicTreeUI.java:2667)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:220)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:220)	at java.awt.Component.processMouseEvent(Component.java:3714)	at java.awt.Component.processEvent(Component.java:3546)	at java.awt.Container.processEvent(Container.java:1164)	at java.awt.Component.dispatchEventImpl(Component.java:2595)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2210)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)	at java.awt.Container.dispatchEventImpl(Container.java:1200)	at java.awt.Window.dispatchEventImpl(Window.java:912)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:319)	at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)