Hello,
I am using gPPI with SPM12 and am failing at model estimation. It will create the model in SPM.mat in corresponding folder. The message display is like this:


SPM12: spm_fMRI_design (v5183) 15:57:21 - 10/05/2017
========================================================================
Saving fMRI design : ...SPM.mat saved

SPM12: spm_fmri_spm_ui (v6088) 15:57:22 - 10/05/2017
========================================================================
Mapping files : ...done
Calculating globals : ...done
Saving SPM configuration : ...SPM.mat saved
estimate_PPI.m
SPM12: spm_spm (v6842) 15:58:22 - 10/05/2017
========================================================================
SPM12: spm_est_non_sphericity (v6827) 15:58:26 - 10/05/2017
========================================================================
Estimation Failed


No more specific error messages. I can still run the estimation using SPM12 afterwards manually, but I don't know what's the problem with it. 
I'm attaching the SPM.mat file it generated and failed to estimate.
I appreciate any help/thought.

Thanks,
Agnes