Hi @AmirJafari,
Have you try these solutions:
-
Increase the Java heap memory size?
Philips-EGI MFF import error - #2 by Raymundo.Cassani -
Double-check that there are no other programs using the MFF at the same time?
Philips-EGI MFF import error - #6 by Francois
Do you mean only Brainstorm or also Matlab?