# Could not find any EEG data in the 0 files found in mff **URL:** \ **Category:** Support & Discussions\ **Tags:** data-import\ **Created:** [May 5, 2022, 6:10pm UTC](https://mne.discourse.group/t/could-not-find-any-eeg-data-in-the-0-files-found-in-mff/4831 "2022-05-05T18:10:50Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Subrat\_Bastola](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/subrat_bastola/32/1190_2.png) [@Subrat\_Bastola](https://mne.discourse.group/u/Subrat_Bastola)\ **Post date:** [May 5, 2022, 6:10pm UTC](https://mne.discourse.group/t/could-not-find-any-eeg-data-in-the-0-files-found-in-mff/4831/1 "2022-05-05T18:10:50Z")
@drammock @alexrockhill I was trying to read an mff file and I came across this error ```python --------------------------------------------------------------------------- FileNotFoundError Traceback (most recent call last) Input In [6], in () ----> 1 raw= mne.io.read_raw_egi(fname) File :12, in read_raw_egi(input_fname, eog, misc, include, exclude, preload, channel_naming, verbose) File ~/anaconda3/envs/mne/lib/python3.9/site-packages/mne/io/egi/egi.py:156, in read_raw_egi(input_fname, eog, misc, include, exclude, preload, channel_naming, verbose) 154 input_fname = str(input_fname) 155 if input_fname.endswith('.mff'): --> 156 return _read_raw_egi_mff(input_fname, eog, misc, include, 157 exclude, preload, channel_naming, verbose) 158 return RawEGI(input_fname, eog, misc, include, exclude, preload, 159 channel_naming, verbose) File :12, in _read_raw_egi_mff(input_fname, eog, misc, include, exclude, preload, channel_naming, verbose) File ~/anaconda3/envs/mne/lib/python3.9/site-packages/mne/io/egi/egimff.py:379, in _read_raw_egi_mff(input_fname, eog, misc, include, exclude, preload, channel_naming, verbose) 318 @verbose 319 def _read_raw_egi_mff(input_fname, eog=None, misc=None, 320 include=None, exclude=None, preload=False, 321 channel_naming='E%d', verbose=None): 322 """Read EGI mff binary as raw object. 323 324 .. note:: This function attempts to create a synthetic trigger channel. (...) 377 .. versionadded:: 0.15.0 378 """ --> 379 return RawMff(input_fname, eog, misc, include, exclude, 380 preload, channel_naming, verbose) File :12, in __init__ (self, input_fname, eog, misc, include, exclude, preload, channel_naming, verbose) File ~/anaconda3/envs/mne/lib/python3.9/site-packages/mne/io/egi/egimff.py:394, in RawMff. __init__ (self, input_fname, eog, misc, include, exclude, preload, channel_naming, verbose) 391 input_fname = _check_fname(input_fname, 'read', True, 'input_fname', 392 need_dir=True) 393 logger.info('Reading EGI MFF Header from %s...' % input_fname) --> 394 egi_info = _read_header(input_fname) 395 if eog is None: 396 eog = [] File ~/anaconda3/envs/mne/lib/python3.9/site-packages/mne/io/egi/egimff.py:210, in _read_header(input_fname) 197 def _read_header(input_fname): 198 """Obtain the headers from the file package mff. 199 200 Parameters (...) 208 Main headers set. 209 """ --> 210 mff_hdr = _read_mff_header(input_fname) 211 with open(input_fname + '/signal1.bin', 'rb') as fid: 212 version = np.fromfile(fid, np.int32, 1)[0] File ~/anaconda3/envs/mne/lib/python3.9/site-packages/mne/io/egi/egimff.py:27, in _read_mff_header(filepath) 25 def _read_mff_header(filepath): 26 """Read mff header.""" ---> 27 all_files = _get_signalfname(filepath) 28 eeg_file = all_files['EEG']['signal'] 29 eeg_info_file = all_files['EEG']['info'] File ~/anaconda3/envs/mne/lib/python3.9/site-packages/mne/io/egi/general.py:146, in _get_signalfname(filepath) 142 all_files[signal_type] = { 143 'signal': 'signal{}.bin'.format(bin_num_str), 144 'info': infofile} 145 if 'EEG' not in all_files: --> 146 raise FileNotFoundError( 147 'Could not find any EEG data in the %d file%s found in %s:\n%s' 148 % (len(infofiles), _pl(infofiles), filepath, '\n'.join(infofiles))) 149 return all_files FileNotFoundError: Could not find any EEG data in the 0 files found in /home/subrat/Downloads/PhantomRebuilt_HDEEG256_04172022_L6_20220417_165929.mff: ``` I was able to open it with Brainstorm. Previously, I came across a similar problem which I could solve by changing the event file name in my mff file. Can anyone of you look into this problem to see what is causing the issue? Currently I am opening the file by converting it into edf by using brainstorm. The google drive link is attached below. [https://drive.google.com/drive/folders/1WxTKsXAJLVDybEo49MVrkJJyK5DDc\_A8?usp=sharing](https://drive.google.com/drive/folders/1WxTKsXAJLVDybEo49MVrkJJyK5DDc_A8?usp=sharing) ---
**Author:** ![alexrockhill](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/alexrockhill/32/31_2.png) [@alexrockhill](https://mne.discourse.group/u/alexrockhill)\ **Post date:** [May 5, 2022, 7:17pm UTC](https://mne.discourse.group/t/could-not-find-any-eeg-data-in-the-0-files-found-in-mff/4831/2 "2022-05-05T19:17:58Z")
I don’t really know anything about mmf files, maybe someone who has worked with that date type can help, sorry. ---
**Author:** ![scott-huberty](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/scott-huberty/32/2715_2.png) [@scott-huberty](https://mne.discourse.group/u/scott-huberty)\ **Post date:** [May 7, 2022, 11:31pm UTC](https://mne.discourse.group/t/could-not-find-any-eeg-data-in-the-0-files-found-in-mff/4831/3 "2022-05-07T23:31:30Z")
Hi @Subrat_Bastola I read in one of your files using `mne.io.read_raw_egi()` and it seems to load okay for me. I am using MNE-Python 1.0.2, the latest stable release. If you downloaded the file from a server (or google drive), due to the nature of the .mff file format, .mff files can be corrupted during the download process if you don’t zip the file first (it has happened to me many times). Although I am not sure if this is what caused your issue, it is only a guess. Hope this helps.