public static function error_500($error_message)
{
header($_SERVER["SERVER_PROTOCOL"] . " 500 Internal Server Error", true, 500);
DOM::start();
DOM::html()->body()->append_h1('500 Internal error');
DOM::html()->body()->append_p($error_message);
echo DOM::generate();
trigger_error('App error fired', E_USER_NOTICE);
exit;
}
