I want to separate site server from uploaded files server

[abofars503430]

Hi All

This script is wonderful
Adam has solved most of the problems

This remains a problem :
when to separate site server from uploaded files server
Our site is called keepshare.net ,so first we created account in the server and named it files.keepshare.net and we uploaded all core files into the new account files.keepshare.net and copy all files from keepshar.net (local) to files.keepshare.net
and we uploaded _config.inc.php and .htaccess
then we moves files/ folder from the main site to the new file server account
then we changed serverID in database to the files to ServerID of the new file server (files.keepshare.net)
but it gives me Internal server Error 500 from files.keepshare.net
by examining the log it gives me
[Sun Feb 09 11:24:26 2014] [alert] [client 41.68.196.34] /home/fileskee/public_html/.htaccess: RewriteRule: bad flag delimiters

this is htaccess

RewriteEngine On
RewriteBase /
RewriteRule ^(.+)\~s$ '.WEB_ROOT.'/$1~s [L]
RewriteRule ^(.+)\~i$ '.WEB_ROOT.'/$1~i [QSA,L]
RewriteCond %{REQUEST_URI} ^(.+)\~d$
RewriteRule ^(.*) delete_file.php?u=$1 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !\.html$
RewriteRule ^(.*) file_download.php?u=$1 [QSA,L]
RewriteRule ^(.*).html$ $1.php [QSA,L]

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Now I deleted files.keepshare.net and I request new installation of the new remote server file on this account

so can u please fix it or install new file server ?