Fix WordPress Problem

Hi there, we have a "There has been a critical error on this website" notice after trying to get a backup (using All-in-1-WP-Migration plugin. Need assistance fixing the error, then uploading the backup, and then making sure everything works well.

The website is WordPress. Hosting is GoDaddy (Deluxe Managed WordPress)

This should be done now, not in a few days. If you can't complete this task right now, please don't bid on it.