Hello, I'm trying to use surface sweep but I keep getting the error "the intermediate profile #2 could not be solved...", and I can't figure out where the problem is.

The basic objective is to top that section with something like a dome, since this part is going to be used as a model for an amputated arm prosthetic, and that part is just cut off due to an issue with the 3d scanner, and unfortunately I can't scan again. The dimension of the pink line you see in the image must remain the same so it fits the measures.

Thanks in advance,

Ana