Niche Script 500 Internal Server Error

Hi I keep getting internal server error in my site http://www.pronepal.com

I am using 1and1 hosting and this has happened before because of .htaccess . Can someone help me with that... Here is my .htaccess file:

Code:

Options -MultiViews RewriteEngine On #detail page #RewriteRule ^video/(.*)/(.*).html detail.php?vid=$1 #RewriteRule ^profile/([a-zA-Z0-9]*).html user_profile.php?u=$1 #RewriteRule ^profile/([a-zA-Z0-9]*)/videos.html user_videos.php?u=$1 #RewriteRule ^profile/([a-zA-Z0-9]*)/videos/page([0-9]*).html user_videos.php?u=$1&p=$2 RewriteRule ^video/(.*)/(.*).html detail.php?vid=$1 RewriteRule ^profile/([a-zA-Z0-9]*)$ user_profile.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/$ user_profile.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/videos$ user_videos.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/videos/$ user_videos.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/videos/page([0-9]*).html user_videos.php?u=$1&p=$2 RewriteRule ^profile/([a-zA-Z0-9]*)/favorites$ user_favorites.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/favorites/$ user_favorites.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/favorites/page([0-9]*).html user_favorites.php?u=$1&p=$2 RewriteRule ^profile/([a-zA-Z0-9]*)/playlists$ user_playlists.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/playlists/$ user_playlists.php?u=$1 RewriteRule ^profile/([a-zA-Z0-9]*)/playlists/page([0-9]*).html user_playlists.php?u=$1&p=$2 RewriteRule ^profile/([a-zA-Z0-9]*)/playlists/([a-zA-Z0-9]*)/(.*)/page([0-9]*).html user_playlists_entry.php?u=$1&lid=$2&p=$4 RewriteRule ^profile/([a-zA-Z0-9]*)/playlists/([a-zA-Z0-9]*)/(.*)/$ user_playlists_entry.php?u=$1&lid=$2 #RewriteRule ^profile/([a-zA-Z0-9]*)/playlists/([a-zA-Z0-9]*)/(.*)$ user_playlists_entry.php?u=$1&lid=$2 #other page, process in list.php RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-l RewriteRule ^.* list.php

Please Help

Thanks