Talos docs

animator-layer-bone-unknown

Since 0.7

a layer's mask (include, exclude or weights) names a bone the rig does not have; printed once per asset when the animator is built, and that layer is left out while the others work

Plain text
Severitywarning

Meaning

a layer's mask (include, exclude or weights) names a bone the rig does not have; printed once per asset when the animator is built, and that layer is left out while the others work

Fix

use the rig's joint names (the canonical humanoid's, or the model's own when it is not retargeted); GET /feel and the model's glTF list them