I'm going through the stim folder, but I don not see any stimlist for the pic images. i.e., your file calls from a stimlist called "pics" but I don't see a pics.txt file in your stim folder. In your case, pics.txt should have content that looks something like this:
pic1.bmp
pic2.bmp
[revised by moderator Sep 20, 2007]
the above should read:
pic1
pic2