I've a dataset of eeg from https://physionet.org/content/eegmmidb/1.0.0
so I've faced a problem when I add channel file and generate a head model so there is 2 channels unknown , knowning there is in channal file and I used R2013a
If you are a new Brainstorm user: before trying to process your own recordings, please start by following all the introduction tutorials (section "Get started") using the example datasets provided. Then follow advanced tutorials following your topics of interest, starting with "EEG and Epilepsy".
https://neuroimage.usc.edu/brainstorm/Tutorials
When you are done with this, please get to us with some more explanations for each of your errors.
The two error messages you reported both include the explanation of the problem or instructions to fix the issue. I don't know what to add in order to help you.
Thank you