Precondition Failed

As of recently I've encounded a VERY serious problem that has suddenly crippled my forum. Whenever someone posts a message, it seems that Apache decides to take a **** on the post and return the following message:

Precondition Failed Originally Posted by Apache
412 Precondition Failed

The precondition on the request for the URL /modules.php evaluated to false.
Any idea what the hell this means? I encountered this a few months ago, but it oddly passed when I resubmitted my post, but now it rejects my post. Absolutely no friggen clue what its doing.

BTW, I did not change any of my code so how can I fix this? This is killing my site even more for me. Precondition Failed

Thanks in advance.

 

 

 

 

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