[Tinyos-help] a problem about powertossim

[Nancy]

Hi everyone,
   when I tried to use powertossim to simulate tinydiff in tinyos1.1.15,the simulation 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>

Can someone help me?

                                                                                            yours sincerely 

                                                                                                               Nancy

 

 
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