installing and configuring wp integration WHMCS with wordpress

OK I just copied the wp-integration to the root of the WHMCS folder which is in a sub directory of the root of the site.. is that what's causing this do I need to change anything ideas suggestions are much appreciate it...

Warning: explode() [function.explode]: Empty delimiter in /home/usphero/public_html/data-cloud/wp-content/plugins/whmcs-wordpress-integration/whmcs-integration.php on line 939

Warning: implode() [function.implode]: Invalid arguments passed in /home/usphero/public_html/data-cloud/wp-content/plugins/whmcs-wordpress-integration/whmcs-integration.php on line 939