An unusual encounter

[Brandoman(br_blaze)]

Hi, so I've been making avatars for a while now so I've had my fair share of problems. However, this is the first time I've had this problem and I can't seem to fix it, so I've come for help.
So basically I've rigged my model and was ready to upload it to VRChat, when I see a couple of errors. I think to myself "oh god what have I done now?" and to my surprise it turns out some of the bones aren't specified, eventhough I've rigged them.
The messages I've got are:
"Your avatar is humanoid, but it's feet aren't specified!"
"Your avatar is humanoid, but it's upper arms aren't specified!"
"Humanoid avatar must have a head, hands and feet bones mapped"
Can anyone help?

[Brandoman(br_blaze)]

Ok so I managed to find out the problem so if anyone sees this and has the same problem, here's what I found:
I had changed the names of the bones in the scene editor so it couldn't detect where the bone was.

[Uchiki]

Thank you, I was searching for this thing and always erased a 0 to have the title more clear and didn't made the link.
Your comment helped plenty !

[KasparoVv]

Omg haha, yep this was exactly what I just ran into. Thank you so much for describing the problem and your solution!