Imbo\Model\Error::getErrorMessage PHP Method

    public function getErrorMessage()
    {
        return $this->errorMessage;
    }

 /**
  * Set an error model and update some parts of the response object
  *
  * @param Model\Error $error An error model instance
  * @return Response
  */
 public function setError(Model\Error $error)
 {
     $errorMessage = $error->getErrorMessage();
     $this->headers->add(array('X-Imbo-Error-Message' => $errorMessage, 'X-Imbo-Error-InternalCode' => $error->getImboErrorCode(), 'X-Imbo-Error-Date' => $error->getDate()->format('D, d M Y H:i:s') . ' GMT'));
     $this->setStatusCode($error->getHttpCode(), $errorMessage)->setEtag(null)->setLastModified(null);
     $this->setModel($error);
     return $this;
 }