PHP Fatal error

[Wind Antara]

how to fix this 

PHP Fatal error:  Call to undefined method EnvayaSMS_Request::is_validated() in /home/intechpe/panel.intechpedia.net/envaya/example/www/gateway.php on line 20

on line 20 :

if (!$request->is_validated($PASSWORD))

{

    header("HTTP/1.1 403 Forbidden");

    error_log("Invalid password");    

    echo $request->render_error_response("Invalid password");

    return;

}

$action = $request->get_action();

[Ilham zar]

This error your function cant detected.maybe wrong spell or maybe you not create the function

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[Ilham zar]

EnvayaSMS_Request::is_validated()
Your function is_validated() is wrong spell or maybe nit created in EnvayaSMS_Request