Forum error messages

Anyone get couple of php error messages ? seems like 2 or 3 weeks since i got those.

Code:

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ajax request http error 0

Fatal error: PHP notice in file /var/www/vhosts/dual-boxing.com/httpdocs/forum/templates/compiled/38_0_2_thread.php (258): Object of class Avatar could not be converted to int

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I've gotten this e/m a few times today.

Can you tell me what you were doing when you get these? I've gotten them a few times myself but haven't been able to pin down the source.