Unspecified Javascript Error***

URL of experiment: https://run.pavlovia.org/MSLWPG/ponzo-illusion-study/html/

Description of the problem: My experiment works perfectly fine in builder, I don’t get any error messages whatsoever when trying to run online. But then I get the classic “unspecified javascript error” and I have absolutely no idea where to start. Any help would be much appreciated.