function errorMessage($value)
{
static $errorMessages;
if (!isset($errorMessages)) {
$errorMessages = array(PAGE_FACTORY_ERROR => 'unknown error', PAGE_FACTORY_ERROR_NOT_FOUND => 'page not found');
}
if (PageFactory::isError($value)) {
$value = $value->getCode();
}
return isset($errorMessages[$value]) ? $errorMessages[$value] : $errorMessages[PAGE_FACTORY_ERROR];
}
