Another spline issue in Creo elements/direct modeling

I have another spline that I just can't seem to get to make a surface. There has to be a better way to do surfacing in this program. Anyways I have attached the package. I get the error "Edges define an invalid mesh".

I went around and checked for duplicate lines, but I don't see any. I'm not sure what else to do.

If anyone knows of any good tutorials or training for surfacing that would be helpful too! Thanks!