can’t login to my admin after Fedora 30 and WP upgrade

I installed WordPress 5.4.1 some time ago after shifting my server space over from Fedora 20 to Fedora 30 to permit an update to my PHP (the server had been running version 5.5.26). I used the manual install instructions to the letter, including disabling of plugins, because my server said that autoinstalls of WordPRess might not yet work with the new version of Fedora. After manual installing the new WordPress files, I get the following message when trying to login to access my admin page:

“There has been a critical error on your website. Please check your site admin email inbox for instructions.

Learn more about debugging in WordPress.”

I obviously can’t read the email WordPress is sending me without being able to get into my dashboard. I tried reverting back to Fedora 20 for my university server locker/hostnames but still the same message.

Any suggestions?

Thanks in advance!!

The page I need help with: [log in to see the link]