For further reference, here is the result of the private discussion we had douoht and I:
The error happens when a CurvyGenerator is part of a prefab, including the meshes it generated, and then the instanciated prefab tries to remove those generated meshes, for example when combining all the splitted meshes into one.
The solution is either to unpack the prefab instance (disconnect the prefab instance from the prefab) or remove the generated meshes from the prefab.
A more helpful message error will be included in the next Curvy update
The error happens when a CurvyGenerator is part of a prefab, including the meshes it generated, and then the instanciated prefab tries to remove those generated meshes, for example when combining all the splitted meshes into one.
The solution is either to unpack the prefab instance (disconnect the prefab instance from the prefab) or remove the generated meshes from the prefab.
A more helpful message error will be included in the next Curvy update
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