public static function getInstance()
{
if (self::$instance === null) {
self::$instance = new self();
$xmlstr = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<errors/>";
if (self::$xml === null) {
self::$xml = new \SimpleXMLElement($xmlstr);
self::$xml->addChild("error", "500");
self::$xml->addChild("description", "Internal Server Error");
self::$stacktraces = self::$xml->addChild("stacktraces");
}
}
return self::$instance;
}