Thank you so much for the effort on this great toolbox!

I just installed the new spm_estimate_PPI.m and spm_spm_WB.m in recent post and give it a try again.
However, this time gPPI stoped at spm_fMRI_dsign. Here is the error message:

SPM12: spm_fMRI_design (v5183) 14:51:29 - 02/12/2016
========================================================================
Saving fMRI design : ...SPM.mat saved
estimate_PPI.m
Estimation Failed
Warning: Missing conditions!!! Invalid Contrast
Invalid Contrast
PPI Contrasts were not estimated for some reason.

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Sorry I don't have any clue how this happen. If I can help on clarifying something, please let me know.

Many thanks,
Yu-Shiang Su