500 Internal Server Error- Any ideas?

[wrestlepower]

well, checking the server error log, i have the following error listed several times today.

[Sun May 25 05:49:34 2008] [alert] [client 66.249.66.242] /home/forums/public_html/.htaccess: Invalid command 'SecFilterEngine', perhaps misspelled or defined by a module not included in the server configuration

As you can see, it references .htaccess, so i renamed .htaccess as test as you suggested and it didn't make any difference. In case it helps, this is the contents of ht.access

RewriteEngine on

RewriteCond %{HTTP_HOST} ^wrestlestop.net$ [OR]
RewriteCond %{HTTP_HOST} ^www.wrestlestop.net$
RewriteRule ^(.*)$ http://www.wrestlepower.net [R=301,L]

Any ideas as to why this would suddenly happe now after several yers? ANyway, thanks very much for the help so far Marco.