Hello!
So I am trying to make a VRChat avatar, but I keep getting the error message as seen above and I am not sure why. When I finish in the rig configuration area, everything is green and seems to be alright. Then when I go back to check on it, everything is messed up again and I have that error. Any help is appreciated, pictures below.
Could you rename the bone names so it is easier to assist?
Unity3d have told you your Character isn’t in T-POSE.
You should rename you bone to friendly English.