We get incorrect error message: KeyError("'A'") Instead of: - Number of Seats cannot be higher than Number of Candidates. How to reproduce the issue: [options] method = sss seats = 5 tiebreaker = None verbosity = 1 [ballots] 2 ballots: A=5 B=4 C=0 D=0 A=0 B=4 C=0 D=5