a problem in ica with GIFT

 hi,everyone,i'm new to rest-state fmri,and i am learning ICA with GIFT. I analysised a set of data of rest-state fmri with GIFT, preprocessed with DPARSF (basic), after i set up a analysis, and press the "run the  analysis", the matlab report an error like picture ,,i don't know why ,and what role of a mask is, i find some instructions about mask in GIFT mannul as below

dear dr. Zhang, can you help me with this problem.
sincerelly hoping your answer ,