What error exactly? I've never gotten an error message, but I've gotten plenty of incorrect animation behavior. Rotations don't work right because SL applies rotation components in a different order. To make bone rotations that import correctly, use this workaround: https://www.youtube.com/watch?v=LfYG9Dq-pTA. (Text version: Face your armature and model toward +X with +Z up. Apply rotations. Rotate your armature (and mesh if it isn't the armature's child) so it's lying
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