meshing a s813 airfoil with gambit
 

hi
im using a tutorial to mesh a s813 airfoil for 2D analysis in fluent,ive meshed edges as u can see in attached pics,but i get this erros when i wanna mesh the arc face "number of intervals on meshed edges of face ... does not allow meshing using a scheme of map" ,with assumption of chord=1
what it is wrong here?

Attachment 39922

Attachment 39923

you cannot mesh this surface with map
you need to split this surface in order to get an C-grid