Failure in error report using $modx->runProcessor

$response = $modx->runProcessor('element/chunk/create',array(
   'name' => 'NewChunk',
   'description' => 'A test Chunk made with runProcessor.',
   'snippet' => '<h3>Chunkify!</h3>',
));
if ($response->isError()) {
    return 'Error:'.$response->getMessage();
}
$chunkArray = $response->getObject();
return 'The chunk "'.$chunkArray['name'].' was created with ID '.$chunkArray['id'];

if ($response->isError()) {
     if ($response->hasFieldErrors()) {
          $fieldErrors = $response->getAllErrors();
          $errorMessage = implode("\n", $fieldErrors);
     } else {
          $errorMessage = 'An error occurred: ' . $response->getMessage();
     }
    return $errorMessage;
}