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This exception has no message.
java.lang.NullPointerException: 	at com.apple.mrj.internal.awt.graphics.MacCompPeerGraphicsConfig.getImage(MacCompPeerGraphicsConfig.java:733)	at com.apple.mrj.internal.awt.graphics.BasicPen.compositeDrawOrFill(BasicPen.java:328)	at com.apple.mrj.internal.awt.graphics.CGPen.draw(CGPen.java:583)	at com.apple.mrj.internal.awt.graphics.CGPen.drawRect(CGPen.java:1966)	at com.apple.mrj.internal.awt.graphics.BasicPen.drawRect(BasicPen.java:214)	at com.apple.mrj.internal.awt.graphics.PenGraphics.drawRect(PenGraphics.java:965)	at com.mathworks.mwt.dnd.DragItem$MouseDragger.drawDragOutline(DragItem.java:309)	at com.mathworks.mwt.dnd.DragItem$MouseDragger.setDragOutlineVisible(DragItem.java:364)	at com.mathworks.mwt.dnd.DragItem$MouseDragger.mouseDragged(DragItem.java:528)	at java.awt.AWTEventMulticaster.mouseDragged(AWTEventMulticaster.java:256)	at java.awt.Component.processMouseMotionEvent(Component.java:3755)	at com.mathworks.mwt.text.MWTextView$TextCanvas.processMouseMotionEvent(MWTextView.java:6813)	at java.awt.Component.processEvent(Component.java:3544)	at java.awt.Component.dispatchEventImpl(Component.java:2589)	at java.awt.Component.dispatchEvent(Component.java:2493)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2446)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2200)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2120)	at java.awt.Container.dispatchEventImpl(Container.java:1195)	at java.awt.Window.dispatchEventImpl(Window.java:966)	at java.awt.Component.dispatchEvent(Component.java:2493)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:334)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:126)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:88)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:80)