AttributeError: 'str' object has no attribute 'isoformat' about python-hsreplay HOT 3 CLOSED

WARNING:root:python-dateutil is not installed. Timestamp parsing may not work properly.
Traceback (most recent call last):
  File "./convert.py", line 13, in <module>
    main()
  File "./convert.py", line 9, in main
    print(log_to_xml(f))
  File "/home/benedict/Dokumente/HSReplay/python/hsreplay/__init__.py", line 302, in log_to_xml
    parser.read(fp)
  File "/home/benedict/Dokumente/HSReplay/python/src/hearthstone/hearthstone/hslog/parser.py", line 445, in read
    self.read_line(line)
  File "/home/benedict/Dokumente/HSReplay/python/src/hearthstone/hearthstone/hslog/parser.py", line 453, in read_line
    ts = self.parse_timestamp(ts)
  File "/home/benedict/Dokumente/HSReplay/python/src/hearthstone/hearthstone/hslog/parser.py", line 437, in parse_timestamp
    ret = parse_timestamp(ts)
  File "/home/benedict/Dokumente/HSReplay/python/src/hearthstone/hearthstone/hslog/parser.py", line 22, in parse_timestamp
    return datetime.strptime(ts[:-1], self.timestamp_format)
NameError: name 'self' is not defined