Alfonso, this problem does not happen when I select Volume: same as template (2mm isotropic voxels) in Analysis Space and Explicit mask in Analysis mask. However, I would like to create images with the same dimensions of the functional images, so it would be useful if I understand what is causing the error.
Please disregard by message above, now I realize that it has nothing to do with the dimensions of my data entry.
Thank you by advance!