1 hour ago, CJH said:I am running Presta 8.0.2 and was using php 7.4, which is very old. Presta 8.x runs with a recommended php 8.1, so I upgraded to this version (being forced to by my hosting servive).
you should look for a hoster who does not force you.
Updates: you check at best locally, over localhost or have a test install in your server.
Error log is often under var > logs > Apache or nginx