bugfixing

zimbraSingle.php

@@ -14,6 +14,8 @@ if (!defined("WHMCS")) {
     die("This file cannot be accessed directly");
 }
 require_once dirname(__FILE__) . '/zimbraSingle.inc';
+use WHMCS\User\Client;
+
 
 function zimbraSingle_TestConnection($params)
 {