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

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ava.lang.NullPointerException:
at com.embarcadero.uml.ui.swing.drawingarea.ADDrawingAreaControl.enterModeFromButton(ADDrawingAreaControl.java:4773)
at com.sun.tools.ide.modeling.drawingarea.CreatePalette$PalettePropertyChangeListener.propertyChange(CreatePalette.java:135)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:270)
at org.netbeans.modules.palette.PalettePanel.setSelectedItem(PalettePanel.java:198)
at org.netbeans.modules.palette.PaletteCategoryDescriptor$1.valueChanged(PaletteCategoryDescriptor.java:75)
at javax.swing.JList.fireSelectionValueChanged(JList.java:1317)
at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1331)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:408)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:417)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:441)
at javax.swing.JList.setSelectionInterval(JList.java:1604)
at javax.swing.plaf.basic.BasicListUI$Handler.adjustSelection(BasicListUI.java:2316)
at javax.swing.plaf.basic.BasicListUI$Handler.adjustFocusAndSelection(BasicListUI.java:2275)
at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(BasicListUI.java:2256)
at org.netbeans.modules.palette.CategoryList$CategoryListUI$ListMouseInputHandler.mousePressed(CategoryList.java:275)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:222)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:221)
at java.awt.Component.processMouseEvent(Component.java:5485)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3889)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

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