Is your followers_list populated with tweet user.screen_names? If yes, there is a topic on the issue that should help you here .
The followers_list should be inside a comma-separated list, for example:
stream = tweepy.Stream(auth, StreamWatcherListener(), timeout=None)
follow_list = ['1234567890', '2345678901']
track_list = None
stream.filter(follow_list, track_list)
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