# python wp_chat.py -f /abc/xpto.txt -n xpto -p WhatsApp -o xpto.json
Traceback (most recent call last):
File "wp_chat.py", line 239, in <module>
main()
File "wp_chat.py", line 234, in main
c.all_features(pattern_list=args['regexes'])
File "wp_chat.py", line 110, in all_features
self.features.compute_response_time_and_burst(self.messages, self.root, self.senders, initiation_thrs, burst_thrs, response_thrs)
File "/root/whatsapp-parser/wp_parser/ChatFeatures.py", line 27, in compute_response_time_and_burst
t0 = list_of_messages[0].datetime_obj
IndexError: list index out of range