Surface has no facets

[y32k]

I've imported some 2D geometry from AutoCAD and I want to turn the lines into surfaces. When I extrude a line to form a surface, it creats the surface but when I go to select it for further manipultaion I get a message saying that it has no facets. I've tried deleting the imported line and drawing a new one in its place but the same thing occurs. Is there a way to fix this?
I don't want to create boundry surfaces everytime I need a new surface because it takes so much longer.

 

[40818]

With 2D elements i generally create the surfaces between 2 or more curves if i'm creating the geometry myself.

 

[Ronald62]

Did you make the shell element mesh by extrtuding the curve? Or did you make at first the surface (geometry) by extruding the curve and then meshed the surface?