hi everyone
     I have installed tinyos1.1.15 today.However when I tried to use 
powertossim to simulate tinydiff in it(command I used is: java 
net.tinyos.sim.Simdriver -noconsole -gui),the tinyviz GUI can't pop out cause a 
problem appeared as following:
    Loading simulator plugins
    Exception in thread "main" java.lang.NullPointerException
           at net.tinyos.sim.PluginManager.register<pluginManager.java:77>
           at net.tinyos.sim..SimDriver.<init>(SimDriver.java:258)
           at net.tinyos.sim.SimDriver.main<SimDriver.java:539>
    I installed tinyos1.1.10 earlier and the tinyviz can run properly,but when 
i update it to 1.1.15,it can't work. What's wrong with it?
                                                yours sincerely,
                                                     Nancy
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