plik .htaccess Opcje

[Roguś]

Witam. Nie mogę sobie poradzic z konfiguracja tego pliku. Jak tylko dodam linijki :
php_value upload_max_filesize 50 M
php_value post_max_size 50 M
to wyskakuje blad

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Internal Server Error
 
The server encountered an internal error or misconfiguration and was unable to complete your request.
 
Please contact the server administrator, webmaster@rogus.livenet.pl 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.
 
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
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Potrzebuje wyslac plik o wielkosci 50mb na serwer a limit ustawiony jest na 2