I have the following .htaccess file:

Options +FollowSymlinks
RewriteEngine On
RewriteRule ^(.*)\.(xml) CMS/php/redirect.php [L]
RewriteRule !^(.*)\.(.{1,5})$ CMS/php/redirect.php

This file is causing my webserver to give the following error message:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

This .htaccess file used to work fine, until now.. im using Apache 2

Any ideas?