public function addValidationErrors($field, $errors)
{
$this->paramsIsValid = false;
if (!isset($this->paramErrors[$field])) {
$this->paramErrors[$field] = array();
}
if (is_string($errors)) {
$errors = array($errors);
}
$this->paramErrors[$field] = array_merge($this->paramErrors[$field], $errors);
}