BIDS App PyMVPA chnk length error


I’ve used the participant_prep on my subjects, resampled my masks (ref), both successful. However, when I attempt participant_test, I receive an error that the chnk[sic] length is incorrect. If I select individual participants, the number can change (despite the protocol being the same for everyone). I have four runs of 238 volumes each, for a total of 952 volumes. The chnk error is sometimes that 1904 doesn’t match 952, or 3504 (as I recall) doesn’t match 952.
My data were previously processed with fmriprep.
Thanks for any insight.


I’ve been around the world looking at an SPM solution (magic numbers in the code), and attempting to install PyMVPA on macOS (lots of clashes with python versions, etc.). So installed NeuroDebian on VirtualBox, which comes with its own challenges.

I’d really like to get the Docker going, and would really appreciate any guidance on the “chnk length” errors.


Would appreciate any input.