Birkaç çözüm buldum ingilizce olarak;
I think it's only when logged in that you get these errors because I can't find them on your website.

try
- deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).

- Deleting the wp-admin and wp-includes folders from the server and then re-upload them from a fresh download of WordPress by using FTP or whatever file management application your host provides.

Tüm eklentileri pasif yapıp deneyiniz bide