"ModuleNotFoundError: No module named 'mne._fiff' - Issue with MNE Python during TFR extraction for one subject"

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  • MNE version: 1.2.1
  • operating system: Windows 11

Hello,

I am analyzing EEG data using MNE-Python, and I encountered a ‘ModuleNotFoundError’ when processing one specific subject. This error doesn’t occur with other subjects. Below is the relevant part of my code and the error traceback.

Error Traceback:

Traceback (most recent call last):
  File "C:\PhD Project\05_PupilCIT\eeg_cit_analysis\batch_process.py", line 69, in <module>
    process_subject(subjects[0])
  File "C:\PhD Project\05_PupilCIT\eeg_cit_analysis\batch_process.py", line 43, in process_subject
    au.proc_subject(subject_nr, stats=INDIV_STATS)
  File "C:\Users\mayws\anaconda3\envs\elp\lib\site-packages\datamatrix\_functional\_memoize.py", line 236, in _call_without_arguments
    self._fnc(*args, **kwargs)
  File "C:\PhD Project\05_PupilCIT\eeg_cit_analysis\analysis_utils.py", line 50, in proc_subject
    sdm = extract_dm(raw, events, metadata)
  File "C:\Users\mayws\anaconda3\envs\elp\lib\site-packages\datamatrix\_functional\_memoize.py", line 236, in _call_without_arguments
    self._fnc(*args, **kwargs)
  File "C:\PhD Project\05_PupilCIT\eeg_cit_analysis\analysis_utils.py", line 72, in extract_dm
    extract_TFR(sdm, raw, t1_triggers, metadata)
  File "C:\PhD Project\05_PupilCIT\eeg_cit_analysis\analysis_utils.py", line 107, in extract_TFR
    tfr_epochs = eet.autoreject_epochs(raw, t1_triggers,
  File "C:\Users\mayws\anaconda3\envs\elp\lib\site-packages\datamatrix\_functional\_memoize.py", line 214, in _call_without_arguments
    is_cached, retval = self._read_cache(memkey)
  File "C:\Users\mayws\anaconda3\envs\elp\lib\site-packages\datamatrix\_functional\_memoize.py", line 294, in _read_cache
    obj = pickle.load(fd)
ModuleNotFoundError: No module named 'mne._fiff'

I also want to mention that I am using an older version of MNE-Python (1.2.1) because upgrading to the latest version introduces other compatibility issues with my existing code, such as other packages for EEG and pupil data analysis (‘eeg_eyetracking_parser’). Thus, I’m trying to resolve this issue while staying on version 1.2.1.

Any help or suggestions would be greatly appreciated!

2

Hello, this seems to be an incompatibility between datamatrix and MNE-Python. You should reach out to the datamatrix developers to find out which version supports MNE-Python 1.2.1.

Best wishes,
Richard