Unable to Overlay Single Subject FDC

Hello all, was following this tutorial and I’m finding that while I can calculate statistics for FDC I’m unable to actually overlay any individual subject FDC onto a template image. I can do so for any individual subject FC and FD without any issue, but with my calculated FDC I’m not able to. Here’s the code I used to calculate FDC: foreach * : mrcalc ../template/fd/IN.mif ../template/fc/IN.mif -mult ../template/fdc/IN.mif