The message shows an error at line 395 in in_fopen_edf.m.
However, in the current version of Brainstorm, there is a comment at this line:
https://github.com/brainstorm-tools/brainstorm3/blob/master/toolbox/io/in_fopen_edf.m#L395
Please update Brainstorm and try again.
If you still get an error, please:
- post the new error message
- share an example file: zip the EDF file, upload it somewhere, post the download link here