DPARSF slice timing process errors

Dear all REST experts:

I used DPARSF in the past without any errors and bugs. However, recently I faced the following processing problems and bugs. Can anybody help me or give me some suggestios? Thank you.

??? Error using ==> spm_slice_vol
Cant get filename.
 
Error in ==> spm_slice_timing at 213

REST slice Viewer显示的自由度可能是错的吗?

老师好,我用REST做了双样本t检验后,用REST slice Viewer显示,然而我看到自由度上面默认的是33,然而我的两组被试一共37,也就是自由度应该是n1+n2-2=35,我记得严老师说过REST slice Viewer可以读取自由度,这是不是REST slice Viewer的错误吗?