BlendSrf can't append edge


I have an issue with the command BlenSrf on Rhino for mac. I have been using this command on Rhino for windows lately for the same kind of surfaces without any issue.

When I select the edges and press enter, nothing happens and I get the message " can’t append edge"
I tried to rebuild the surfaces, change the direction of the surfaces without any luck.
I don’t even get the control points option.

I have a tight deadline and this is delaying me.

If I could get some help it would be much appreciated.


I forgot to add a screenshot, sorry. Here

Hi Pauline- please post a file with the surfaces or send to, we’ll take a look.