Something wrong with these .htaccess rewrite rules?

[Max Taxable]

When i install this in my .htaccess file the site kicks the "Internal Server Error" page. Even if that is all that is in the file. What's wrong?

RewriteEngine On

# If you are having problem with "None Could Be Negotiated" errors in Apache, uncomment this to turn off MultiViews
# Options -MultiViews

RewriteCond %{REQUEST_URI} !(admincp/|dbseocp/|modcp/|cron|mobiquo|forumrunner|api\.php)
RewriteRule ^((archive/)?(.*\.php(/.*)?))$ dbseo.php [L,QSA]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !/(admincp|dbseocp|modcp|clientscript|cpstyles|images)/
RewriteRule ^(.+)$ dbseo.php [L,QSA]