Type error: not a function - half way through experiment on Pavlovia

[wakecarter]

Pavlovia is currently down: fire at datacenter

Update: We can confirm that the pavlovia server was fortunately in a building that was not affected by the fire. We are currently waiting to hear when OVH will be able to turn the power back on and we will update you as soon as we know more. We have some rather shocking news right now that the company (OVH) providing servers supporting pavlovia.org has had a major incident - a fire in one of their buildings - and that has caused pavlovia.org to be shutdown temporarily. We are currently trying …

You could try copying the essential project files to a clean folder and try to create it as a new project.