Unable to assign property "MeshId"

I’m getting this error message while trying to Instance.new(“MeshPart”) and setting its MeshId Property. Why is this happening? is there no way to do this? or am i doing it wrong?

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Unfortunately I don’t think ROBLOX has gotten around to allow scripts to set MeshID’s yet. I’ve looked around for this a couple of times and never been able to find a solution

According to the API Reference page for MeshPart.MeshID*, it’s not possible to set that property using a script.

*Apparently, there is no page for MeshId. That redirects to MeshID.

Edit: also, as you’ll note, the error says “Script write access is restricted”, which one can interpret to mean that the script cannot write to (make changes to) that property.

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Here is a solution to this problem:
Instead of using a MeshPart, use a regular Part with a SpecialMesh inside it.
Apparently, the MeshId property of a SpecialMesh may be set using a script.

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InsertService:CreateMeshPartAsync is now an available alternative, but for plugins only.

See post here for alternatives: Add the ability to instantiate meshes with a new MeshId during runtime - Feature Requests / Engine Features - Developer Forum | Roblox