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Unable to switch to run mode

URL of experiment: https://run.pavlovia.org/Kvodacek/control_full_v1/html/

Description of the problem: I can run the experiment with no issues in PILOT mode. The issue arises when I switch to RUN mode. The run button grays out and the url displays this message:
“Unfortunately we encountered an unspecified error (error code: 40.)
Try to run the experiment again. If the error persists, contact the experiment designer.”

Any suggestions will be very appreciated, thank you!