<ipython-input-25-acf0568a07e0>:1: RuntimeWarning: Could not define the number of bytes automatically. Defaulting to 2.
  data = mne.io.read_raw_cnt('test.cnt', preload=True, montage=None, stim_channel=True)
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-25-acf0568a07e0> in <module>
----> 1 data = mne.io.read_raw_cnt('test.cnt', preload=True, montage=None, stim_channel=True)

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in read_raw_cnt(input_fname, montage, eog, misc, ecg, emg, data_format, date_format, preload, stim_channel, verbose)
    176     return RawCNT(input_fname, montage=montage, eog=eog, misc=misc, ecg=ecg,
    177                   emg=emg, data_format=data_format, date_format=date_format,
--> 178                   preload=preload, stim_channel=stim_channel, verbose=verbose)
    179
    180

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in __init__(self, input_fname, montage, eog, misc, ecg, emg, data_format, date_format, preload, stim_channel, verbose)
    430         input_fname = path.abspath(input_fname)
    431         info, cnt_info = _get_cnt_info(input_fname, eog, ecg, emg, misc,
--> 432                                        data_format, _date_format, stim_channel)
    433         last_samps = [cnt_info['n_samples'] - 1]
    434         _check_update_montage(info, montage)

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in _get_cnt_info(input_fname, eog, ecg, emg, misc, data_format, date_format, stim_channel_toggle)
    293         if stim_channel_toggle:
    294             data_format = 'int32' if n_bytes == 4 else 'int16'
--> 295             annot = _read_annotations_cnt(input_fname, data_format=data_format)
    296             events = (np.stack((annot.onset * sfreq,
    297                                 annot.duration * sfreq,

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in _read_annotations_cnt(fname, data_format)
     68
     69     with open(fname, 'rb') as fid:
---> 70         teeg = _read_teeg(fid, teeg_offset=event_table_pos)
     71
     72     event_parser = _get_event_parser(event_type=teeg.event_type)

~/.local/lib/python3.5/site-packages/mne/io/cnt/_utils.py in _read_teeg(f, teeg_offset)
     26     teeg_parser = Struct('<Bll')
     27
---> 28     f.seek(teeg_offset)
     29     return Teeg(*teeg_parser.unpack(f.read(teeg_parser.size)))
     30

OSError: [Errno 22] Invalid argument

<ipython-input-30-dbbb56936797>:1: FutureWarning: The parameter `stim_channel` controlling the stim channel synthesis has not been specified. In 0.18 it defaults to True but will change to False in 0.19 (when no stim channel synthesis will be allowed) and be removed in 0.20; migrate code to use `stim_channel=False` and :func:`mne.events_from_annotations` or set `stim_channel=True` to avoid this warning.
  data = mne.io.read_raw_cnt('test.cnt', preload=True, montage=None)
<ipython-input-30-dbbb56936797>:1: RuntimeWarning: Could not define the number of bytes automatically. Defaulting to 2.
  data = mne.io.read_raw_cnt('test.cnt', preload=True, montage=None)
Reading 0 ... 4528779  =      0.000 ...  4528.779 secs...
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
<ipython-input-30-dbbb56936797> in <module>
----> 1 data = mne.io.read_raw_cnt(test.cnt', preload=True, montage=None)

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in read_raw_cnt(input_fname, montage, eog, misc, ecg, emg, data_format, date_format, preload, stim_channel, verbose)
    176     return RawCNT(input_fname, montage=montage, eog=eog, misc=misc, ecg=ecg,
    177                   emg=emg, data_format=data_format, date_format=date_format,
--> 178                   preload=preload, stim_channel=stim_channel, verbose=verbose)
    179
    180

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in __init__(self, input_fname, montage, eog, misc, ecg, emg, data_format, date_format, preload, stim_channel, verbose)
    439         data_format = 'int32' if cnt_info['n_bytes'] == 4 else 'int16'
    440         self.set_annotations(
--> 441             _read_annotations_cnt(input_fname, data_format=data_format))
    442
    443     @verbose

~/.local/lib/python3.5/site-packages/mne/io/cnt/cnt.py in _read_annotations_cnt(fname, data_format)
     68
     69     with open(fname, 'rb') as fid:
---> 70         teeg = _read_teeg(fid, teeg_offset=event_table_pos)
     71
     72     event_parser = _get_event_parser(event_type=teeg.event_type)

~/.local/lib/python3.5/site-packages/mne/io/cnt/_utils.py in _read_teeg(f, teeg_offset)
     26     teeg_parser = Struct('<Bll')
     27
---> 28     f.seek(teeg_offset)
     29     return Teeg(*teeg_parser.unpack(f.read(teeg_parser.size)))
     30

OSError: [Errno 22] Invalid argument

mne.sys_info()
Platform:      Linux-4.4.0-151-generic-x86_64-with-Ubuntu-16.04-xenial
Python:        3.5.2 (default, Nov 12 2018, 13:43:14)  [GCC 5.4.0 20160609]
Executable:    /usr/bin/python3
CPU:           x86_64: 12 cores
Memory:        Unavailable (requires "psutil" package)
mne:           0.18.1
numpy:         1.16.3 {blas=openblas, lapack=openblas}
scipy:         1.3.0
matplotlib:    3.0.1 {backend=TkAgg}

sklearn:       0.19.1
nibabel:       Not found
mayavi:        Not found
cupy:          Not found
pandas:        0.22.0
dipy:          Not found