Hi,I am using Ubuntu ,Tinyos2 .When I run Mviz application it gives me some 
error and the new java window is blank.
tk...@cnsr-2:/opt/tinyos-2.1.0/apps/MViz$ tos-mviz -comm 
@serial/dev/ttyUSB1:iris MVizMsg


/opt/tinyos-2.1.0/support/sdk/java/tinyos.jar:.Making MVizMsgUnable to find 
message type MVizMsg: please check your 
CLASSPATH../mote.gifjava.lang.ClassNotFoundException: MVizMsgException in 
thread "main" java.lang.NullPointerException      at 
net.tinyos.message.MoteIF.init(MoteIF.java:119)      at 
net.tinyos.message.MoteIF.<init>(MoteIF.java:110)    at 
net.tinyos.mviz.MessageInput.createSource(MessageInput.java:72)      at 
net.tinyos.mviz.MessageInput.<init>(MessageInput.java:51)    at 
net.tinyos.mviz.DDocument.main(DDocument.java:303)Exception in thread 
"AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1        at 
java.util.ArrayList.get(ArrayList.java:324)  at 
net.tinyos.mviz.DNavigate.redrawAllLayers(DNavigate.java:194)        at 
net.tinyos.mviz.DDocument$DPanel.paintComponent(DDocument.java:455)  at 
javax.swing.JComponent.paint(JComponent.java:1029)   at 
javax.swing.JComponent.paintChildren(JComponent.java:864)    at 
javax.swing.JComponent.paint(JComponent.java:1038)   at 
javax.swing.JComponent.paintChildren(JComponent.java:864)    at 
javax.swing.JComponent.paint(JComponent.java:1038)   at 
javax.swing.JLayeredPane.paint(JLayeredPane.java:567)        at 
javax.swing.JComponent.paintChildren(JComponent.java:864)    at 
javax.swing.JComponent.paintToOffscreen(JComponent.java:5131)        at 
javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:278)
    at javax.swing.RepaintManager.paint(RepaintManager.java:1220)   at 
javax.swing.JComponent.paint(JComponent.java:1015)   at 
java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)        at 
sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)     at 
sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)       at 
java.awt.Container.paint(Container.java:1780)        at 
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)        at 
javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)        at 
javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)     at 
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)    at 
java.awt.EventQueue.dispatchEvent(EventQueue.java:597)       at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)  
     at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)    
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)    
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)


plz help me guysTaim                                      
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