Error message when starting up after installing OS 12.2

Hi all,

I have a 2018 iMac Last week, I upgraded to OS 12.2, but even since there has been an error message every time I start the computer. The message reads something like "Your computer was shut down because of a problem..." Even though I shut down through the apple menu, and there were no other issues.

I was very sick when the update came through. I figured it was the perfect time as I didn't need the computer much. I did find it odd that it didn't restart, but remained off. I'm wondering if something happened during installation. What can I do to fix this problem?