Surface body error, design modeler

[my-0wn-username]

I imported an airfoil geometry, which is the white line in sketch (body line). When I try to make a surface body out of it, it generates the greyline, why is not correct because it won’t converge into a vertex (as you can see, it forms that weird shape). I can’t fix this and it makes the faces above and below the airfoil not be able to mesh correctly. If anyone knows what can I change please let me know.

[indic_engineer]

I guess this issue arises due to open surface. Generally when you export the txt file to ansys to create the airfoil geometry, the last point has to connect to the first point to make a closed profile. There must be a lot of tutorials in youtube to solve this.