Error 403 when clicking on url generated by Pavlovia

URL of experiment:
https://run.pavlovia.org/Hofweber/experiment_2c

Description of the problem:
I have uploaded an experiment to Pavlovia. It runs successfully when I am logged into Pavlovia and click the “run” button. However, the url generated for online testing does not seem to work. When participants click on the url, they get an 403 error.

I have a shorter test version on Pavlovia structured in exactly the same way, but involving less stimuli, which runs fine, using the url https://run.pavlovia.org/Hofweber/test_2c/html

Does anybody have a suggestion as to what could be going wrong here?

You’ve uploaded your JS files to the html folder so use https://run.pavlovia.org/Hofweber/experiment_2c/html/