Openbci-streamer AttributeError: 'CytonRFDuino' object has no attribute 'daisy'

I installed openbci-streamer using the git repository on python 3.8 and runned this code:

import time
from openbci_stream.acquisition import OpenBCIConsumer
with OpenBCIConsumer(mode='serial', endpoint='/dev/ttyUSB0', streaming_package_size=250) as (stream, openbci):
    t0 = time.time()
    for i, message in enumerate(stream):
        if message.topic == 'eeg':
            print(f"{i}: received {message.value['samples']} samples")
            t0 = time.time()
            if i == 9:
                break

It is an example of: https://openbci-stream.readthedocs.io/en/latest/
I received this error:

`WARNING:OpenBCI-Stream:'pyedflib' is needed for export to EDF
WARNING:OpenBCI-Stream:No module named 'pyedflib'
Traceback (most recent call last):
  File "/home/sjoerd/Documents/BCI_online_teleoperation/OpenBCI stream/OpenBCI-Streamer.py", line 4, in <module>
    with OpenBCIConsumer(mode='serial', endpoint='/dev/ttyUSB0', streaming_package_size=250) as (stream, openbci):
  File "/home/sjoerd/anaconda3/envs/openbci-env/lib/python3.8/site-packages/openbci_stream/acquisition/consumer.py", line 92, in __init__
    self.openbci = Cyton(mode=mode,
  File "/home/sjoerd/anaconda3/envs/openbci-env/lib/python3.8/site-packages/openbci_stream/acquisition/cyton.py", line 835, in __init__
    openbci.append(CytonRFDuino(end, host, daisy[board_id], mtg,
  File "/home/sjoerd/anaconda3/envs/openbci-env/lib/python3.8/site-packages/openbci_stream/acquisition/cyton.py", line 247, in __init__
    super().__init__(daisy, montage, streaming_package_size,
  File "/home/sjoerd/anaconda3/envs/openbci-env/lib/python3.8/site-packages/openbci_stream/acquisition/cyton_base.py", line 210, in __init__
    self.montage = montage
  File "/home/sjoerd/anaconda3/envs/openbci-env/lib/python3.8/site-packages/openbci_stream/acquisition/cyton_base.py", line 254, in montage
    if self.daisy:
  File "/home/sjoerd/anaconda3/envs/openbci-env/lib/python3.8/site-packages/openbci_stream/acquisition/cyton_base.py", line 815, in __getattribute__
    return super().__getattribute__(attr)
AttributeError: 'CytonRFDuino' object has no attribute 'daisy'`

Anybody know how to fix it?