multisite htaccess spawns http 500 error

Hello
I’m having issues getting multisite up and running. I have wordpress 3.0.1 successfully installed to https://www.mydomain.com/snapshots/ when it comes to enabling multisite I follow the instructions and after adding the suggested code blocks I get a HTTP 500 error. I know it’s my htaccess file but i’m not sure what i need to modify.

heres what WP told me to use:

RewriteEngine On
RewriteBase /snapshots/
RewriteRule ^index\.php$ - [L]
# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]
# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

Everything looks in order but obviously not.