Multi-site config file issue (new server and new domain)

Hello,

i am moving my multisite to a new domain.

it used to be under a folder like (mysite.com/1/mysite)

now i am using it under a sub folder (site.mysite.com)

i disabled the multi-site when moving to my new domain and server.

I am having problem with setting up the config file and .htaccess for this.

The error messaging i am getting is the homepage is taking me to
http://http//site.mysite.com/wp-signup.php?new=site.mysite.com

these are my settings: I copied them from the network. But i added the value for sub domain manually since i am using one now.

Note i see an error message in my tools->Network
Warning: An existing WordPress network was detected.

/* Multisite */
define( 'WP_ALLOW_MULTISITE', true );
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'http://site.mysite.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

and .htaccess

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ wp/$1 [L]
RewriteRule . index.php [L]

do you guys see any problem with these? If i remove these codes from config file single site works fine. so i think the problem is with my config file.

please help
thanks