How to use the meteomatics.api.query_grads_timeseries function in meteomatics

print("filename = {}".format(filename_nc))
        except Exception as e:
            print("Failed, the exception is {}".format(e))

        print("\nGrads plot:")
        try:
            api.query_grads(filename_grads, startdate_grads, parameters_grads, lat_N, lon_W, lat_S, lon_E, res_lat,
                            res_lon,
                            username, password, model_grads, area=area_grads)
            print("filename = {}".format(filename_grads))
        except Exception as e:
            print("Failed, the exception is {}".format(e))

        print("\ngrads timeseries:")
        try:
            api.query_grads_timeseries(prefixpath_grads_ts, startdate_grads_ts, enddate_grads_ts, interval_grads_ts,
                                       parameters_grads_ts, lat_N, lon_W, lat_S, lon_E, res_lat, res_lon, username,
                                       password, model=model_grads_ts, area=area_grads_ts)
            print("prefix = {}".format(prefixpath_grads_ts))
        except Exception as e:
            print("Failed, the exception is {}".format(e))

        print("\nfind stations:")
        try:
            met = api.query_station_list(username, password, startdate=startdate_station_ts, enddate=enddate_station_ts,
                                         parameters=parameters_station_ts)
            print(met.head())
        except Exception as e:
            print("Failed, the exception is {}".format(e))

        print("\nstation coordinates timeseries:")
        try: