Gpf_Rpc_Form::setErrorMessage PHP Method

        public function setErrorMessage($message)
        {
            $this->isError = true;
            $this->errorMessage = $message;
        }

 private function validate(Gpf_Rpc_Form $form) {
     require_once('../include/Pap/Features/ReCaptcha/recaptchalib.php');
     if ((is_null($form->getFieldValue("recaptcha_challenge_field")) || $form->getFieldValue("recaptcha_challenge_field") == '') && 
     (is_null($form->getFieldValue("recaptcha_response_field")) || $form->getFieldValue("recaptcha_response_field") == '')) {
         $form->setErrorMessage($this->_("The reCAPTCHA isn't configured correctly") . ': ' . $this->_("wrong public key or check template 'signup_fields.tpl' if contains: {widget id=\"recaptcha\"}"));
         return;
     }
     if (is_null($form->getFieldValue("recaptcha_response_field")) || $form->getFieldValue("recaptcha_response_field") == '') {
         $form->setErrorMessage($this->_("The reCAPTCHA wasn't entered correctly"));
         return;
     }
     $resp = recaptcha_check_answer (Gpf_Settings::get(Pap_Settings::RECAPTCHA_PRIVATE_KEY),
     $_SERVER["REMOTE_ADDR"],
     $form->getFieldValue("recaptcha_challenge_field"),
     $form->getFieldValue("recaptcha_response_field"));
     if (!$resp->is_valid && $resp->error == 'incorrect-captcha-sol') {
         $form->setErrorMessage($this->_("The reCAPTCHA wasn't entered correctly"));
         return;
     }
     if (!$resp->is_valid && $resp->error == 'invalid-site-private-key') {
         $form->setErrorMessage($this->_("The reCAPTCHA isn't configured correctly") . ': ' . $this->_("wrong private key"));
         return;
     }
     if (!$resp->is_valid) {
         $form->setErrorMessage($this->_("The reCAPTCHA isn't configured correctly") . " Error: " . $resp->error);
         return;
     }
 }