Mesh import error, "no meshes found to import"

I'm converting an adult base game hair to child, I fix the mesh in blender, do hat chops, do cut numbers, change all the necessary things in s4s but when I go to import the adjusted mesh, I get this error

I have already done the cut numbers, so I don't understand why I'm getting this error

I'm a bit new to CC creation and have been following tutorials but haven't been able to figure this problem out and appreciate any help!

.blend file and .package here