Can't create a new user

Hi, when I try to create a new user, every time I got the popup below.

An error occur during the request. Unable to proceed.
User does not exist

I checked other posts and tried change the difficulty(keepass generator) of the password but nothing happens, also I have activated the php posix module because was getting a message in the logs, but that doesn’t resolve the problem about creating a user.

PS: Previous I was using the version 13.0.8, but since Softaculous doesn’t have anymore the upgrade for 14.0.4, and it doesn’t allow the upgrade straight to 15.0.0, I done a complete new deploy.

Nextcloud version 15.0.0
Apache Version 2.2.29
PHP Version 7.2
Linux Version ?