YII PHP - I have an old YII (v.1) script that's throwing an error.log that needs fixed.

I have an old YII (v.1) script that's throwing an error.log that needs fixed. When I am running php 7.4 it runs fine - but when I switch to php 8 it throws a fatal error and produces a stack trace within error.log file.

There seems to only be one depreciated warning and one fatal error due to switching to php 8 and I'd like to get this solved asap.