Error 404 Cant create a new blog

when some try to create a blog on my site they get this Error 404
The page you are looking for could not be found.
Registration Settings
Allow new registrations- Logged in users may register new sites.
my site is http://gossipmoms.byethost22.com/

Im using the latest buddypress

htaccess

# BEGIN s2Member GZIP exclusions
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{QUERY_STRING} (^|\?|&)s2member_file_download\=.+
RewriteRule .* – [E=no-gzip:1]
</IfModule>
# END s2Member GZIP exclusions

RewriteEngine On
RewriteBase /
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).*) $1 [L]
RewriteRule ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

wp.config

[Moderated]

please help me, because I dont know what to do

sorry its long but I dont know how to put it in a scroll box