I'm using Conn 21.a, and I just imported files using new (import) from fmriprep. The subject-specific ROIs populated correctly, but when I go to add an additional ROI , like Shen_2mm_268_parcellation.nii, it gives me the following error:
"
Index exceeds the number of array elements (0).

Error in conn (line 3052)
filename1=CONN_x.Setup.rois.files{nsub}{nrois}{1}{1};
Error in conn_filesearchtool (line 285)
if length(h.callback)>1, feval(h.callback{1},h.callback{2:end},names); else, feval(h.callback{1},names); end
"

I believe this is a problem with the setup, not the ROI, because when I use 'networks.nii' or 'atlas.nii', it also gives the same error. 

Any advice?

Thank you! 
Isaac