I get "Additionally, a 404 Not Found error"

[Sele]

 

Not Found

The requested URL was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

 

I get this error above everytime I navigate to any part of my forum, to any section or thread.

I did rerwiting urls in Manage Conversions and now I can't access any section of the forum.

What can I do?

I cleared system cache and I tried running the support thing.

[Sele]

Fixed it by disabling it.