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Um. Basically means that in your code you are doing an illegal operation on a thread object (or a threadgroup object, whichever)...
Don't forget that Java is synonimous with "secure", and explicitelly prevents some of the practices that would of been okay with an other language. For example, considering this is an applet you're running, you should remember that you cannot access data or classes from a foreign domain, short of creating a socket and having the other side stream the data (lol)...
Which comes to the question: are you sure it was working in the first place? 
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