Ello!
This could be from a lot of things and it is pretty hard to narrow it down without more information.
Make sure it is under 10k vertices and is the correct file type (like FBX or OBJ)
Try exporting without bones and see if you get that error. That may help us narrow it down.
Those are my ideas with the current information. If you could tell us more that would be very helpful 
It is below 10k vertices and it is the correct filetype. In fact, it was a mesh uploaded by roblox which i exported and uploaded as my own. I was trying to create an editable mesh for using the new wrap deformers. This is the line that errors:
local editableMeshCageTarget = assetService:CreateEditableMeshAsync(targetCage.MeshContent)
Does create editable mesh not support skinned meshes??? I though this was fixed. And if they don’t, how are thet supported in the demo?
Correct, EditableMesh doesn’t yet support skinned meshes. It’s listed in the ‘known issues’ of the most recent devforum announcement about EditableMeshes. Skinning support for EditableMesh is in active development.
Currently the only way to deform a mesh with skinning data is to use WrapDeformer, which will deform meshes, including skinning and FACS data.
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