Simplifying Meshes With Auto-LOD problem

I have trouble in simplifying meshes with Auto-LOD,I can only do this thing successfully when using “skull.babylon” mesh, but when I used my own gltf/glb models or other babylon official models, I got an ERROR!How to make it correct?Here are error and playground link.

newMeshes[0] is not a valid mesh. It is the root node of the scene; i.e. an empty mesh.

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Got it!Thanks for your answer! :+1: :+1: