This bug has been reported many time over at least the last two years. Happens all the time in long threads. No idea why. And no idea why it hasn't been fixed yet ...
It looks like the database functions in the ASP page caught an unhandled exception. Depending on who wrote the forum software, the YouPlayIt administrator may not be able to fix it. I suspect they got the forum web pages from a 3rd party to start with, it is not their bug.
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