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java.lang.NullPointerException: disposed component	at sun.awt.windows.Win32SurfaceData.initOps(Native Method)	at sun.awt.windows.Win32SurfaceData.(Win32SurfaceData.java:450)	at sun.awt.windows.Win32SurfaceData.createData(Win32SurfaceData.java:326)	at sun.awt.windows.WComponentPeer.(WComponentPeer.java:510)	at sun.awt.windows.WLabelPeer.(WLabelPeer.java:42)	at sun.awt.windows.WToolkit.createLabel(WToolkit.java:311)	at java.awt.Label.addNotify(Label.java:171)	at java.awt.Container.addNotify(Container.java:2049)	at java.awt.Panel.addNotify(Panel.java:71)	at java.awt.Container.addNotify(Container.java:2049)	at java.awt.Panel.addNotify(Panel.java:71)	at java.awt.Container.addNotify(Container.java:2049)	at java.awt.Window.addNotify(Window.java:418)	at java.awt.Frame.addNotify(Frame.java:482)	at java.awt.Window.show(Window.java:459)	at GridExample.main(GridExample.java:38)