Cannot build and publish avatar

I am really new to unity so I’m not sure what these errors mean- can anyone help me out?

If you search the forums, for the prefab error, you’ll see that everyone is told to look at errors before the two you’ve posted.

Your avatar didn’t build, that covers the first message, and unity’s feelings are hurt, I guess. Like, it didn’t build so that is why it’s not there.

I think the generic avatar didn’t build message should suggest to users to look at earlier errors.

If you look at the older threads, most will be solved with dynamic bones being added to the project, there are some free stubs, but I think paid avatars could use some encouragement to switch to physbones.