500 Error Mid Upgrade

I ran the upgrade and got a 500 error for the whole site. Everything is down. What would be the steps to troubleshoot?
It's for dance-forums.com

Found this in the error log

Sat Jul 06 18:19:09.515103 2024] [lsapi:error] [pid 70365:tid 47689249085184] [client 96.9.213.132:60447] [host www.dance-forums.com] Backend fatal error: PHP Fatal error: Uncaught Error: Class 'Doctrine\\Common\\Cache\\VoidCache' not found in /home/dancefo2/public_html/src/XF/CacheFactory.php:251\nStack trace:\n#0...

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