I think the problem is the "s" on the BATCH.Results.between_subjects.effects_names. I believe it should be

BATCH.Results.between_subjects.effect_names

This is based upon the help in the conn_batch.m script.   I made a similar mistake with onsets.  In my case I left off the "s".

I hope this helps.

Bob



% BATCH.Results PERFORMS SECOND-LEVEL ANALYSES (ROI-to-ROI and Seed-to-Voxel analyses) %!
% Results
%
% between_subjects
% effect_names : cell array of second-level effect names
% contrast : contrast vector (same size as effect_names)
%