M011: nnn weightgroups assigned to non deforming bones in Mesh [sss]
Blender’s Armature allows bones to be marked as deforming (contribute to skeletal animation of meshes) or non deforming (Only contribute to skeletal animation of Bones). Avastar issues a warning if it detects that non deforming bones are assigned to weights. This is not necessarily an error, but its at least a confusing situation.