Hm! It's good to see that you were both able to find solutions to the problem at hand. As Amanda noted, if the files you've specified in your absolute paths do not exist on the machine you're using, a problem could arise. In order to use relative paths, make sure that the files being used are located within the same folder that your experiment is located in; either that, or within a sub-folder of that directory named 'stim' .

Please let me know if I can help or assist in any way.