Hi @Miu,
- Are you able to run the tutorial steps with the provided dataset?
https://neuroimage.usc.edu/brainstorm/Tutorials/Epileptogenicity#DatasetEpileptogenicity.Files
As mentioned in the other post reporting the same error (Please check your data: There are no inmask voxels.), please provide some screenshots of your electrodes and the MRI that is being used.