Problem with the .htaccess-file

Hi there,

I am trying to use a date and name based permalink structure for my wordpress blog. But when I add the following code in my .htaccess file

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /sites/luxurious/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /sites/luxurious/index.php [L]
</IfModule>

The first part of my .htaccess-file doesn’t work anymore, it shows a error page when I visit that website.

My complete .htaccess file looks like this:

# Fix for the missing-trailing-slash for directories # on htaccess-redirected domains/subdomains.
RewriteEngine On
RewriteCond s%{HTTPS} ^((s)on|s.*)$ [NC] RewriteRule ^/*(.+/)?([^.]*[^/])$ http%2://%{HTTP_HOST}/$1$2/ [L,R=301]

Options +FollowSymlinks
RewriteBase /
RewriteCond %{HTTP_HOST} ^wijzijnvetcool.nl [NC,OR]
RewriteCond %{HTTP_HOST} ^www.wijzijnvetcool.nl [NC]
RewriteCond %{REQUEST_URI} !/sites/wijzijnvetcool/  [NC]
RewriteRule ^(.*)$ sites/wijzijnvetcool/$1 [L]

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /sites/luxurious/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /sites/luxurious/index.php [L]
</IfModule>

ErrorDocument 401 /sites/g-network/errors/401.php
ErrorDocument 403 /sites/g-network/errors/403.php
ErrorDocument 404 /sites/g-network/errors/404.php
ErrorDocument 500 /sites/g-network/errors/500.php

What is wrong? Thanks in advance!