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First make sure you are running un up-to-date version of SPM12 (type "spm_update" from the SPM12 folder). Then avoid commenting out lines in SPM code, this will most likely not lead you anywhere.
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Post the full error message you get without modifying anything.
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This error "Please check your data: There are no inmask voxels" indicates that you have no valid data to be tested. This is probably due to a problem with setting the electrodes positions.
Please post a screen capture showing your SEEG electrodes in the MRI.
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I'd recommend you start by following the tutorial using the example dataset instead of your own recordings. This way you'll focus on getting familiar with the tools, and you'll make sure everything works well with your SPM install.