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java.lang.NullPointerException: 	at org.icepdf.ri.common.MyAnnotationCallback.removeAnnotation(MyAnnotationCallback.java:239)	at org.icepdf.ri.common.views.DocumentViewControllerImpl.deleteAnnotation(DocumentViewControllerImpl.java:1250)	at org.icepdf.ri.common.views.DocumentViewControllerImpl.deleteCurrentAnnotation(DocumentViewControllerImpl.java:1238)	at org.icepdf.ri.common.views.DocumentViewControllerImpl$1.actionPerformed(DocumentViewControllerImpl.java:130)	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1662)	at javax.swing.JComponent.processKeyBinding(JComponent.java:2878)	at javax.swing.KeyboardManager.fireBinding(KeyboardManager.java:307)	at javax.swing.KeyboardManager.fireKeyboardAction(KeyboardManager.java:250)	at javax.swing.JComponent.processKeyBindingsForAllComponents(JComponent.java:2970)	at javax.swing.JComponent.processKeyBindings(JComponent.java:2962)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2841)	at java.awt.Component.processEvent(Component.java:6293)	at java.awt.Container.processEvent(Container.java:2229)	at java.awt.Component.dispatchEventImpl(Component.java:4872)	at java.awt.Container.dispatchEventImpl(Container.java:2287)	at java.awt.Component.dispatchEvent(Component.java:4698)	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1887)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)	at java.awt.Component.dispatchEventImpl(Component.java:4742)	at java.awt.Container.dispatchEventImpl(Container.java:2287)	at java.awt.Window.dispatchEventImpl(Window.java:2719)	at java.awt.Component.dispatchEvent(Component.java:4698)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)	at java.awt.EventQueue.access$200(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:694)	at java.awt.EventQueue$3.run(EventQueue.java:692)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)	at java.awt.EventQueue$4.run(EventQueue.java:708)	at java.awt.EventQueue$4.run(EventQueue.java:706)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)