Get back a reference channel from acticap

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Ok here is the code for replicating the error:

import mne
import pandas as pd
import numpy as np
from mayavi import mlab
%matplotlib inline
%gui qt

# Open EEG file
data_path = '/home/sylvain/Desktop/Participant01'
raw_fname = data_path + '/Participant01.vhdr'

## Error further in the code (when adding reference channel) if I open the
file this way
#raw_file = mne.io.read_raw_brainvision(raw_fname,
# ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? event_id={"actiCAP Data On": 9999},
# ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? montage = 'standard_1020',
# ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? preload=True)

# The error diseapear if i just use this
raw_file = mne.io.read_raw_brainvision(raw_fname,
   ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? event_id={"actiCAP Data On": 9999},
   ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? preload=True)

raw_file = mne.io.add_reference_channels(raw_file, ['FCz'])

raw_file.set_montage('standard_1020')
raw_file.plot_sensors()

Do you know where I could stock the file it is quite big?

Thank you

Sylvain