Problem: the part of the page is not loading / I get an empty page / Page gives 500 error

In order to get to the bottom of the problem, I need to see the logs from the server. You can retrieve them via your hosting panel (please refer to your hoster if you don’t know where to get them) - this option actually is preferable, or you can add the following code to the beginning of the page that is not working (after <?php tag):

ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');

then reload the page. If there’s an error message appeared, please share it while reporting the issue, if not - use option 1. I won’t be helping unless logs are provided.

Please, while sharing the logs, make sure you have removed all the sensitive data (passwords, logins, etc.).

! After troubleshooting, don’t forget to remove the lines you added !

Problem: I retrieved the logs, and they say that PHP Warning: require_once(‘file’): failed to open stream: No such file or directory in ‘dir’

Double (or triple, if needed) check that you have uploaded all the files to your webserver.