EXAMPLE:
from obspy.clients.fdsn import Client
from obspy.core.event import Catalog
from eqcorrscan.core.template_gen import template_gen
client = Client('ISC')
catalog = client.get_events(eventid='614566033', includearrivals=True)
print(catalog.__str__(print_all=True))
catalog[0].picks = catalog[0].picks[6:8]
print(catalog[0].picks)
templates = template_gen(method='from_client', catalog=catalog, 
                         client_id='NIEP', lowcut=2.0, highcut=9.0, samp_rate=20.0, filt_order=4, length=3.0, prepick=0.15, swin='all', process_len=200)

1 Event(s) in Catalog:
2018-12-05T00:17:02.280000Z | +45.756,  +26.804 | 3.0  ml
[Pick(resource_id=ResourceIdentifier(id="smi:ISC/pickid=914454268"), time=UTCDateTime(2018, 12, 5, 0, 17, 18, 570000), waveform_id=WaveformStreamID(network_code='IR', station_code='BISRR'), phase_hint='P'), Pick(resource_id=ResourceIdentifier(id="smi:ISC/pickid=914454269"), time=UTCDateTime(2018, 12, 5, 0, 17, 29, 930000), waveform_id=WaveformStreamID(network_code='IR', station_code='BISRR'), phase_hint='S')]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[18], line 9
      7 catalog[0].picks = catalog[0].picks[6:8]
      8 print(catalog[0].picks)
----> 9 templates = template_gen(method='from_client', catalog=catalog, 
     10                          client_id='NIEP', lowcut=2.0, highcut=9.0, samp_rate=20.0, filt_order=4, length=3.0, prepick=0.15, swin='all', process_len=200)

File ~\AppData\Local\anaconda3\envs\eqcorrscan\Lib\site-packages\eqcorrscan\core\template_gen.py:311, in template_gen(method, lowcut, highcut, samp_rate, filt_order, length, prepick, swin, process_len, all_vert, all_horiz, delayed, plot, plotdir, return_event, min_snr, parallel, num_cores, save_progress, skip_short_chans, vertical_chans, horizontal_chans, **kwargs)
    309 if method in ['from_client']:
    310     Logger.info("Downloading data")
--> 311     st = _download_from_client(
    312         client=client, client_type=client_map[method],
    313         catalog=sub_catalog, data_pad=data_pad,
    314         process_len=process_len, available_stations=available_stations,
    315         all_channels=all_channels)
    316 Logger.info('Pre-processing data')
    317 st.merge()

File ~\AppData\Local\anaconda3\envs\eqcorrscan\Lib\site-packages\eqcorrscan\core\template_gen.py:548, in _download_from_client(client, client_type, catalog, data_pad, process_len, available_stations, all_channels)
    545 net, sta, chan, loc = waveform_info
    546 Logger.info('Downloading for start-time: {0} end-time: {1}'.format(
    547     starttime, endtime))
--> 548 Logger.debug('.'.join([net, sta, loc, chan]))
    549 query_params = dict(
    550     network=net, station=sta, location=loc, channel=chan,
    551     starttime=starttime, endtime=endtime)
    552 try:

TypeError: sequence item 3: expected str instance, NoneType found


DATA EXISTS:
from obspy import UTCDateTime
from obspy.clients.fdsn import Client

client = Client("NIEP")
t1 = UTCDateTime(2018, 12, 5, 0, 17, 02.28)
t2 = t1 + 60
st = client.get_waveforms("*", "BISRR", "*", "*", t1, t2)
print(st.__str__(extended=True))
6 Trace(s) in Stream:
RO.BISRR..HHE | 2018-12-05T00:17:02.280000Z - 2018-12-05T00:18:02.280000Z | 100.0 Hz, 6001 samples
RO.BISRR..HHN | 2018-12-05T00:17:02.280000Z - 2018-12-05T00:18:02.280000Z | 100.0 Hz, 6001 samples
RO.BISRR..HHZ | 2018-12-05T00:17:02.280000Z - 2018-12-05T00:18:02.280000Z | 100.0 Hz, 6001 samples
RO.BISRR..HNE | 2018-12-05T00:17:02.280000Z - 2018-12-05T00:18:02.280000Z | 100.0 Hz, 6001 samples
RO.BISRR..HNN | 2018-12-05T00:17:02.280000Z - 2018-12-05T00:18:02.280000Z | 100.0 Hz, 6001 samples
RO.BISRR..HNZ | 2018-12-05T00:17:02.280000Z - 2018-12-05T00:18:02.280000Z | 100.0 Hz, 6001 samples