public function setEmail(string $email) : CNabuDataObject
    {
        if ($email === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$email")
            );
        }
        $this->setValue('nb_user_email', $email);
        
        return $this;
    }