On 2/24/15 5:56 AM, Arijit Ghosh wrote: > I am using the following code for a tetramer modelling: ... > but after running it, the console is showing "raise KeyError <"No such > chain: %s" % indx> > KeyError: 'No such chain: A'"
Your sequence in your alignment file is only a single chain (not four). You seem to be missing chain breaks (/ characters).
Ben Webb, Modeller Caretaker