development plan sheet metal

[fabrizio99]

I would need help with the plan development of a sheet. I don't understand why, when I go to select a edge for guidance, it tells me that "the body contains are disjoining that are not supported for development." I would be very grateful if you helped me, thank you.

 

[reb_bl]

probably the file is not done as a rule of art, if you can mail the file we see

 

[abro]

I add to the post, when developing the sheet does not appear to me down or down, is there any option to activate?