mne-python: ValueError: Could not find EEG array in the .set file.

Describe the bug

Dear MNE developers Thank you for developing this wonderful tool.

I am faced with the error when I tried to use read_raw_eeglab() to load the .set file made by EEGLAB What I did in EEGLAB is just loading the data by Quick 30 and save it in ‘.set(with ‘.fdt’)’ format only. I think this is very weird, so I guess this is bug.

The script I made is below.

subject_name = 'DA'
script_path = os.path.abspath('./Python/EEG_analysis')
data_path = os.path.abspath('./output_play/' + subject_name) 
os.path.exists(data_path + '/'+ subject_name + '.set') # The print out result is 'True'
raw = mne.io.read_raw_eeglab(input_fname = data_path + '/'+ subject_name + '.set')

Actual results

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-17-1519c0d84577> in <module>
----> 1 raw = mne.io.read_epochs_eeglab(input_fname = data_path + '/'+ subject_name + '_play_merged.set')

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/mne/io/eeglab/eeglab.py in read_epochs_eeglab(input_fname, events, event_id, eog, verbose, uint16_codec)
    277     epochs = EpochsEEGLAB(input_fname=input_fname, events=events, eog=eog,
    278                           event_id=event_id, verbose=verbose,
--> 279                           uint16_codec=uint16_codec)
    280     return epochs
    281 

<decorator-gen-198> in __init__(self, input_fname, events, event_id, tmin, baseline, reject, flat, reject_tmin, reject_tmax, montage, eog, verbose, uint16_codec)

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/mne/io/eeglab/eeglab.py in __init__(self, input_fname, events, event_id, tmin, baseline, reject, flat, reject_tmin, reject_tmax, montage, eog, verbose, uint16_codec)
    449                  uint16_codec=None):  # noqa: D102
    450         eeg = _check_load_mat(input_fname, uint16_codec)
--> 451 
    452         if not ((events is None and event_id is None) or
    453                 (events is not None and event_id is not None)):

~/.pyenv/versions/anaconda3-5.3.1/lib/python3.7/site-packages/mne/io/eeglab/eeglab.py in _check_load_mat(fname, uint16_codec)
     63             'mne-python developers for more information.')
     64     if 'EEG' not in eeg:
---> 65         raise ValueError('Could not find EEG array in the .set file.')
     66     else:
     67         eeg = eeg['EEG']

ValueError: Could not find EEG array in the .set file.

Additional information

I am using the latest version of EEGLAB(2021), so there might be some minor change in the .set file. This might be why I am faced with this error.

Thank you in advance.