stop_times.txt:
Required column missing from stop_times.txt: arrival_time
stop_times.txt:
Required column missing from stop_times.txt: departure_time
stop_times.txt:
Required column missing from stop_times.txt: stop_sequence
transfers.txt:
Required column missing from transfers.txt: from_stop_id
transfers.txt:
Required column missing from transfers.txt: to_stop_id
transfers.txt:
Required column missing from transfers.txt: transfer_type
stops.txt:
Required file missing from feed: stops.txt