Error: when setting the image of ImageStim (yet again)

I forked your study and got this error when I tried to run it.

Backslash () shouldn’t be used for paths online. Where did you find the advice to downgrade to 2021.1.3? Here’s your code running in 2024.2.4 (with a foreslash)
https://run.pavlovia.org/test-suite/test_stim_issue/