The "error opening trace file" message is a red herring -- it just means your device doesn't support systrace.
The "Invalid int" message might have something to do with the problem, but really what's happening is something is throwing an exception that isn't caught.
Normally when a thread exits with an uncaught exception you get to see the exception in the log, but something seems to be preventing that here. If you run the app in the debugger, and set an exception breakpoint on all uncaught exceptions, you should be able to see where it's coming from. (Alternatively, try to track down the source of the "Invalid int" message and put a breakpoint there.)
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