[COOT] ramachandran fit error

Hey all, I have a structure with three chains in the asymmetric unit. When I select Refine/Improve Ramachandran Plot from Extensions/All Molecule, coot does its thing until it reaches the end of the second chain, then stops with the errors pasted below. It says something about alternate

Re: [COOT] ramachandran fit error

Andreas Förster wrote: I have a structure with three chains in the asymmetric unit. When I select Refine/Improve Ramachandran Plot from Extensions/All Molecule, coot does its thing until it reaches the end of the second chain, then stops with the errors pasted below. ... Any ideas why