Hello,
Can you please tell me exactly which files you have changed in this post?
After this modification, most users are getting "Invalid token" errors whenever they try to login to the site which is enfuriating some of them (since they are paying to access certain areas of the site).

I need to revert all the changes made and go back to the original files. I'll go back to the 404 errors, as before, and let the users login without issues.

Then, I'll try to fix the 404 again (somehow).

Thank you very much!