java.lang.NullPointerException: This exception has no message.

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at javax.swing.plaf.basic.BasicTreeUI.completeEditing(
at javax.swing.plaf.basic.BasicTreeUI.completeEditing(
at javax.swing.plaf.basic.BasicTreeUI.startEditing(
at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(
at java.awt.Component.processMouseEvent(
at java.awt.Component.processEvent(
at java.awt.Container.processEvent(
at java.awt.Component.dispatchEventImpl(
at java.awt.Container.dispatchEventImpl(

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