I've done a website transfer from one hosting provider to another one. I managed to make the website live in the new hosting, but can't access the Joomla! administration area.
I get this error:
Fatal error: Call to undefined method InvalidArgumentException::getlevel() in /home/u907259166/domains/mydomain.com/public_html/libraries/legacy/error/error.php on line 536.
Hi, I used an FTP connection to downloaded the files and database from the old hosting and to upload them to the new hosting. I updated configuration.php with new $host, $user, $password and $db. The site is alive, but can't access the admin area. Not sure if I missed something here
How can I solve this?