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java.lang.NullPointerException: peer	at sun.awt.windows.WCanvasPeer.create(Native Method)	at sun.awt.windows.WComponentPeer.(WComponentPeer.java:370)	at sun.awt.windows.WCanvasPeer.(WCanvasPeer.java:36)	at sun.awt.windows.WToolkit.createCanvas(WToolkit.java:280)	at java.awt.Canvas.addNotify(Canvas.java:71)	at java.awt.Container.addNotify(Container.java:1574)	at javax.swing.JComponent.addNotify(JComponent.java:3495)