RefitTrim problem

Hi all.

I have a trimmed surface and I would like to use the _RefitTrim command (repair trimmed surface edge), but when I select any edge Rhino tells me “The selected Brep can only have one face”. I have never used this command before, how can I solve it?

Does your surface have only one trimmed edge, and does the trimmed edge of your surface satisfy this requirement:

Select a trimmed edge that crosses the full range of U or V direction of a surface.

The trimmed edge of the surface on the right side cannot be refitted.

If you continue to have questions post a .3dm file with the surface.

ok, so I should only have one edge cut, thx