Centered pop-up window Problem

Hi, I have a scene of a website dedicated to some pictures, with 8 thumbnails that are linked to different web locations. I found the kirupa’s tutorial Launching a Centered Pop-Up Window ( very suitable to what I want, but there is a problem. Only one link works. When I made the second link, an output error appear

(Scene=nerenovate, Layer=1, Frame=1: Line 1: Mouse events are permitted only for button instances
on (release) {

and the second link doesnt works at all. I think the problem is at the actions layer, but don’t know how to solve it. Any one can help me?