I've built several sites with EE but I've never had this error. In my last project, if I try to delete an entry (no matter from which channel) I receive a Not Found Page.
The requested URL /system/index.php was not found on this server.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
I notice, however, that the entry is eventually deleted, but I can't give the client a site with this error and tell him to pretend nothing happened.
What should I do?