CI SOAP Server Problem

[eluser]JanDoToDo[/eluser]
To clarify, i'm testing this code below as the getOrder inserted as above function and it gives me this error:

SoapFault exception: [env:Receiver] Call to a member function get() on a non-object in /var/www/html/public_html/devel/application/controllers/web_client.php:20 Stack trace: #0 /var/www/html/public_html/devel/application/controllers/web_client.php(20): SoapClient->__soapCall('getOrder', Array) #1 [internal function]: Web_client->index() #2 /var/www/html/public_html/devel/system/codeigniter/CodeIgniter.php(233): call_user_func_array(Array, Array) #3 /var/www/html/public_html/devel/index.php(139): require_once('/var/www/html/p...') #4 {main}

Code:

function getOrder($username, $password)
    {
        $this -> ci =& get_instance();
        $user = 'delagua';
        $pass = 'admin123!';
        
        if ($user == $username AND $pass == $password) :
            $query = $this -> db -> get('country_iso');

        
            return 'validation success';
            
        else :
            throw new SoapFault("Server", "Validation Failed");
        endif;
    }

Without the db query, it returns "validation success";