Marathon-LB Connection Problem

2018-11-29 11:46:46,014 marathon_lb: SSE Active, trying fetch events from http://master.mesos:8080/v2/events?plan-format=light&event_type=status_update_event&event_type=health_status_changed_event&event_type=api_post_event
2018-11-29 11:46:46,014 marathon_lb: fetching apps
2018-11-29 11:46:46,020 marathon_lb: Caught exception
Traceback (most recent call last):
  File "/marathon-lb/marathon_lb.py", line 2182, in <module>
    for event in events:
  File "/marathon-lb/marathon_lb.py", line 244, in iter_events
    for line in stream.iter_lines():
  File "/marathon-lb/utils.py", line 246, in _split_lines_from_chunks
    for chunk in chunks:
  File "/marathon-lb/utils.py", line 230, in _iter_chunks
    self._check_status_code()
  File "/marathon-lb/utils.py", line 211, in _check_status_code
    raise Exception(str(self.status_code) + ' ' + self.url)
Exception: 401 http://master.mesos:8080/v2/events?plan-format=light&event_type=status_update_event&event_type=health_status_changed_event&event_type=api_post_event