Help with convert to sheet metal and unfold!

Hi guys,

I have modeled a body in SW, and I want to convert it to a sheet metal and unfold it. I tried a lot of options but I can't get it right.

As I understand, the first thing I need to do, is to convert to a sheet metal part. But when I try this, SW gives the following error : "You must select a fixed planar face or a linear edge on an end face of a cylindrical face."

Could you guys help me with this. Cuz I need to have the drawing tomorrow.

Thanks,

Yuriy

SolidworksSheet Metal