Ok. Found the issue. I changed the following line nirstorm/bst_plugin/inverse/process_nst_cmem.m at master 路 Nirstorm/nirstorm 路 GitHub
from bst_save(ResultFile, ResultsMat, 'v6'); to bst_save(ResultFile, ResultsMat, 'v7.3');
and it is working.
@Raymundo.Cassani It would be great to have a warning or error when bst_save doesn't work 