Problem loading a study

URL of experiment: us_kids_decimals_task [PsychoPy]

Description of the problem: Recently, a participant had difficulty loading our study. They tried Google Chrome and Safari on a new macbook pro; however, they got the following message (see image attached). Others participants haven’t had any problem running the study. Is this a problem with our task or their internet connection? Is there something that we can do to fix this?