Debugging use of PyMVPA BIDS app

Hi. I am attempting to use the following BIDS app for MVPA analysis of

I have successfully gone through step 1. The data I am working with have been preprocessed using fmriprep. I have also created a mask according to the method specified on that page. Has anyone run into a similar error? If so, have you been able to debug it? I am wondering if there is something wrong with the data I am working with, the mask that I have used, or the code.

I currently have the error: (base) wifi-roaming-128-4-168-23:PyMVPA-master Stefan$ python2 -k asl -c struct rand --skip_bids_validator /Users/Stefan/data/bids /Users/Stefan/data/bids/outputs1 participant_test
/Library/Python/2.7/site-packages/mvpa2/testing/ DeprecationWarning: Importing from numpy.testing.decorators is deprecated since numpy 1.15.0, import from numpy.testing instead.
from numpy.testing.decorators import skipif
WARNING: Detected incorrect (nan) scl_ fields. Resetting to scl_slope=1.0 and scl_inter=0.0
* Please note: warnings are printed only once, but underlying problem might occur many times *
Traceback (most recent call last):
File “”, line 280, in[‘chnks’] = chunks_labels # we call this sample attribute ‘chnks’ so later it won’t be mistaken for
File “/Library/Python/2.7/site-packages/mvpa2/base/”, line 599, in setitem
ValueError: Collectable ‘chnks’ with length [3840] does not match the required length [1920] of collection ‘<SampleAttributesCollection: time_coords,time_indices>’.

Thanks much,
Stefan Bartell
graduate student, University of Delaware