nefunguje .htaccesss

Dobrý den,
chtěl bych vás poprosit o radu kde může být zakopaný pes.
v adresáři mám tento soubor .htaccess
Nefunguje mi jen na jednom serveru. Modrwrite je prý zapnuté.
Moc Vám děkuju Milan

RewriteEngine on
Options +FollowSymlinks
RewriteCond %{HTTP_HOST} ^domenayyyy.cz
RewriteRule (.*) http://www.domenayyyy.cz/$1 [R=301,QSA,L]

RewriteCond %{REQUEST_URI} ^/index.php$ [NC]
RewriteRule ^(.*)$ http://www.domenayyyy.cz/ [R=301,L]

Hlásí mi to tuto chybu:

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

Please contact the server administrator, you@example.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.