Are you running the latest CVS snapshot?

I am running the latest CVS snapshot, and am get exactly the same error as you. It was ok before I upgraded from the stable version.

Preethi Naveen wrote:
hi,
i have tried to run tinyviz as given in chapter 5 of tutorial. I am getting the following errors

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)

any idea how to resolve them.
thanks
regards

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