I am currently lofting a tail for an aircraft model and receiving a "Loft operation failed to complete" error message although the preview looks exactly how it is meant to. There was a problem for a time where the lofting operation would not accept both of the guide curves though all the connections were proper but I had fixed that prior this latest problem. Would anyone know how to troubleshoot this? Please see attached images. Thank you.
It is very hard to solve your problem just from the pictures. Try to upload you model using advanced editor.
Anyway it looks like you are trying to achieve too much using just one single loft. To me it seems like the geometry is at least three different sections. Perhaps you should try to solve these with separate lofts/boundaries.