Hello and welcome aboard. This seems to be caused by an installed application. I had a similar problem like that - I would get that "unexpected error message" popping up whenever I'm either using an application, or browsing the web. This is what I did: I uninstall a few apps, and that seems to have fixed the problem.
Also, here is a link to the HTC ChaCha - Android Forums. You will want to checkout what other users might have to say about this issue. Best of luck.
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