Multiple main face meshes!

Multiple main face meshes! More than one mesh with the tag "FACE" detected.

The FACE tag is a unique tag that should be applied to only one mesh as only one mesh can receive animation data. This message indicates that there is more than one mesh object whose name ends with this tag.

Blender

If there are multiple armature objects in your scene please make sure that only one has the "_BODY" suffix in its name.

Maya

>>> [ERROR] Face geometry check - FAIL.
  > No valid blendshapes! There are no blendshapes to apply animation data to.
  > Multiple main face meshes!
  > More than one mesh with the tag "FACE" detected.