Sadly I still get this error
However I did see this before the errors. do you think this is what is causing the audio issues??
Maybe. The "continuity camera" feature's for using an iphone as a webcam, but PNGTuber+ doesn't need a camera, only a mic.
I found a bug report for Godot (the language PNGTuber+ is written in) when googling the first error message. It looks like it hasn't been resolved yet. Unfortunately this app might just not work for you (at least with your current version of macOS).