Event.mouse not a constructor error

Online experiments
1

URL of experiment: https://pavlovia.org/amill99/dare

Description of the problem: Hi! when I run my experiment I get this error:
Unfortunately we encountered the following error:

  • TypeError: event.Mouse is not a constructor

Try to run the experiment again. If the error persists, contact the experiment designer.

however, when I look at my code I can’t seem to find event.Mouse.