MyBB Community Forums

I am getting following error on my site when ever i click on different forums, home page is opening. i did some changed on .htaccess but after that i restored original one but same problem is coming.
----www.oraerp.com
Not Found

The requested URL /Forum-Oracle-Documents-Tutorials was not found on this server.

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

Apache/2.2.17 (Unix) mod_ssl/2.2.17 OpenSSL/0.9.8e-fips-rhel5 mod_fcgid/2.3.5 Phusion_Passenger/2.2.15 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at www.oraerp.com Port 80
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This isn't related to mybb.com whatsoever, plus you've removed Justin's theme copyright notice.

If you were getting that error, you wouldn't have made all the edits for Google SEO.