Error WPMU module WHMCS brigde

Hi,

Just installed above plugin. All went well except I am getting an error: Warning: chmod() [function.chmod]: Operation not permitted in /home/webshop/domains/mydomainname.com/public_html/wp-content/plugins/whmcs-wordpress-integration/whmcs-integration.php on line 340

CHMOD 777 recursive on this file does not fix it.