login fail after moving to another hosting

hello
I’ve been using admin login path hardening with alternative login path (not wp-admin). Now I moved the site to another hosting and trying to login with that address, it opens the login page OK, but then says

Server error 500
The website encountered an error while retrieving http://www.********.ru/wp-admin/. It may be down for maintenance or configured incorrectly.

How do I treat it? Should I delete the plugin entirely via FTP and try again?

https://wordpress.org/plugins/sucuri-scanner/