Errors showing in my cpanel error log
 

Does anyone know why i am getting lots of errors in my error log that are showing this sort of error

File does not exist: /home/xxxxx/public_html/forum, referer: http://www.xxxxx.co.uk/forums/index.php

My forums are under /forums and seem to be working OK but i'm getting lots of these type of errors showing when users are browsing my forums.