Hi,
It appears the QuestionThreads addon is missing its files, and that is the nature of the error.
To fix this I suggest you disable addons at the code level by adding this line to your src/config.php file:
$config['enableListeners'] = false;
That should resolve the error. Then you can login to the Admin CP and disable the addon in there. Then you can remove that line from the config.php file.
$config['fullUnicode'] = true;
$ config ['enableListeners'] = false;
Bunu yapmama rağmen sorun çözülmedi artık HTTP ERROR 500 hatası alıyorum..
Burada bir çözüm gördüm ama sanırım benim konumla ilgili değil:
XF 2.0 - 500 Internal Server Error