Meshing a Periodic channel with high curvature 2D airfoil
 

I'm trying to mesh a 2D airfoil which represents a turbine blade by using this periodic channel that I saw in another thread. My mesh is shown in the attached picture.
I've made my own mesh that looks similar but when I turn it into an unstructured mesh I get a lot of errors saying periodic nodes do not have twins and I have a single edge problem around the perimeter of the mesh. Also attached is the picture of the problems I get when checking the mesh. Any help with why my mesh might have this error would help. Thanks.

Here is the message I get when checking the mesh

It is normal in 2D. Dont worry about it and read the mesh in Fluent.

The grid isn't being accepted into fluent. When I try to read the mesh I get the error "Build Grid: Aborted due to critical error"

either make the mesh periodic in ICEM or change boundary condition (periodic) to wall or interface and then export mesh