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"Undefined" error when piloting study online

URL of experiment:

Description of the problem: When I try to pilot my experiment I get the following error:

Error when fetching information about the experiment: jenni.leppanen/pilot-task-1
If the error persists, contact Pavlovia’s administrator

The experiment runs fine on Psychopy, but clearly I have done something wrong when trying to turn it into an online experiment. I’m sure this is caused by user error, but since the error message is quite vague I’m having hard time figuring out what the problem is. Can anyone help?

What I have done so far: I have made sure that I have html folder and that it is created ‘on sync’, which seems to be a common reason for this type of error. I have also made sure that I followed one of the demos (URL: when adding the code for the two free response answers.

Thank you!

Best wishes,