Homeassistant doesn't start after update


I’ve recently updated HA, now it’s not starting anymore and displays a bunch of errors after start.
Installed in venv as another user.
Here’s the log:

What’s gone wrong?

Thanks in advance!

What did you update from? What did you update to (latest version?).

Most of the errors are related to MQTT, so start there.

Don’t really know, which version was running before - think it was a 99 as well - and updated to 99.3. Followed the update guide.