Tiny Tiny RSS was unable to start properly Please set SELF_URL_PATH to the correct value detected for your server.

Basically this error is telling you that the path in the config.php file is invalid for some reason. The most likely reason being that the http:// is defined and it should be https://

If you open the file config.php in your favourite editor

And navigate to line 21,  depending on your version and edits to the file.

You can update your pat URL to include the “s” in https

Save and you should be able to access the site correctly.