You should probably try asking on the file exchange page as that will go to the authors of the particular app. File exchange submissions are of vastly varying quality so the reasons for something not working could be anything from you using it in an unexpected way to it simply not being programmed correctly.
There may be people in Matlab Answers who have used that particular app though so hopefully someone can help you. Given that its author is 'MathWorks Student Competitions Team' I would assume that in this case it is not simply the case that it is full of bugs, but I wouldn't know.
