.med file mistake upload failed

when I uploaded an already ready mesh file with .med file, then I can come up with this mistake.

Can anyone explain, please?

Upload failed

non-manifold-external-edge

Error Id: 1995b72f

Hi!

I have not seen this error in the past. From what I understand, there is a problem with the mesh definition, like an edge that is not connected or is duplicate. Please check the mesh health and quality in your meshing software.