500 foutmelding

Ik krijg een foutmelding bij mijn blog script.
En ze zeggen dat het aan me .htaccess ligt.
Je krijgt 0,01 punt als je het oplost
Me .htaccess:

RewriteEngine On
Options +Followsymlinks
RewriteBase /
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.* - [L,QSA]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^.*/images/(.*)$ /blog/images/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^.*/uploads/(.*)$ /blog/uploads/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/friends/page([0-9]+)/([^/]+)/?$ /blog/friends.php?w=$1&page=$2$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/friends/page([0-9]+)/?$ /blog/friends.php?w=$1&page=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/friends/([^/]+)/?$ /blog/friends.php?w=$1$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/friends/?$ /blog/friends.php?w=$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/page([0-9]+)/([^/]+)/?$ /blog/index.php?w=$1&page=$2$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/page([0-9]+)/?$ /blog/index.php?w=$1&page=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^profiles/([^/]+)/([^/]+)/?$ /blog/profile.php?u=$1$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^profiles/([^/]+)/?$ /blog/profile.php?u=$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^profiles/?$ /blog/profile.php [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^albums/([^/]+)/([^/]+)/?$ /blog/album.php?u=$1$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^albums/([^/]+)/?$ /blog/album.php?u=$1$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^albums/?$ /blog/album.php?u= [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/archive/([^/]+)/([^/]+)/([^/]+)/?$ /blog/archive.php?w=$1&y=$2&m=$3$4 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/archive/([^/]+)?/([^/]+)/?$ /blog/archive.php?w=$1&y=$2&m=$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/archive/([^/]+)/?$ /blog/archive.php?w=$1$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/archive/?$ /blog/archive.php?w=$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([0-9]+)/([^/]+).html$ /blog/entry.php?w=$1&e_id=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([0-9]+)/([^/]+)/?$ /blog/entry.php?w=$1&e_id=$2$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([0-9]+)/?$ /blog/entry.php?w=$1&e_id=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([^/]+)/page([0-9]+)/([^/]+)/?$ /blog/index.php?w=$1&category=$2&page=$3$4 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([^/]+)/page([0-9]+)/?$ /blog/index.php?w=$1&category=$2&page=$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([^/]+)/([^/]+)/?$ /blog/index.php?w=$1&category=$2$3 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/([^/]+)/?$ /blog/index.php?w=$1&category=$2 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^/]+)/?$ /blog/index.php?w=$1 [L]

RewriteCond %{REQUEST_FILENAME} -d

moet dit niet !-f zijn zoals de rest van je RewriteCond %

Volgensmij niet , want dan komt er te staan 404 Not found.