human
Solve the following python programming problem given the following code:
def _build_arrivals(self, stop, route, stop_time) : 
    def build_arr(day, offset = None) : 
        if (offset is None) : 
            offset = datetime.timedelta () 
time = ((day + datetime.timedelta (seconds = stop_time ['arr'])) + offset) 
        if (not (self.start <= time <= self.end)) : 
            return 
dep = (((day + stop_time ['departure_time']) + offset) if stop_time ['departure_time'] else None) 
        bikes_ok = { 
            1 : True, 
            2 : False, 
}.get (stop_time ['bikes_allowed']) 
        return busbus.Arrival (self.provider, stop = stop, route = route, time = time, departure_time = dep, headsign = stop_time ['trip_headsign'], short_name = stop_time ['trip_short_name'], bikes_ok = bikes_ok, realtime = False) 
days = filter (self._valid_date_filter (stop_time ['service_id']), arrow.Arrow.range ('day', self.start.floor ('day'), self.end.ceil ('day'))) 
    freqs = self._frequencies (stop_time ['trip_id']) 
    trip_start = stop_time ['_min_arrival_time'] 
    for day in days : 
        day = day.replace (hours = 12) 
        for freq in freqs : 
            freq_start = (day + freq ['start_time']) 
            freq_end = (day + freq ['end_time']) 
            rel_time = (freq_start - (day + trip_start)) 
            offset = datetime.timedelta () 
            while ((freq_start + offset) <= freq_end) : 
                arrival = build_arr (day, (route + rel_time)) 
                if arrival : 
                    (yield arrival) 
offset += freq ['headway_secs'] 
if (not freqs) : 
            arrival = build_arr (day) 
            if arrival : 
                (yield arrival) 

    
    

    Fix the buggy line: arrival = build_arr (day, (route + rel_time))
assistant
#Here is Python program to fix the buggy line: arrival = build_arr (day, (route + rel_time))
.

arrival = build_arr (day, (offset + rel_time))