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this is usually means one of two things:
- There is some very unusual code path which, when taken, always causes a crash
- A race condition exists between threads in your program. Thus, the crash appears unpredictably and may be difficult to reproduce
My advice to you is to start the program in the debugger, and leave it running until the exception is thrown. Then you can come back here and provide us with the relevant code, stack trace, debug output, etc.