Error report version 2023.2.3

Searching on the forum I can see that it might be related to your monitor specifications. Try choosing a different monitor in Monitor Centre.

In the words of @TParsons

“wx is the Python package which the PsychoPy app uses to create its interface - so this most likely won’t be affecting your experiment or saved files. It looks like it’s looking for an event (e.g. a click on a button, pressing a key, etc.) and something on the back end isn’t liking it. What were you trying to do when this message appeared?”

If it happens at the end of the frame rate check then perhaps there’s some code in Begin Experiment causing the issue. Do you get the error with a simple experiment with zero code?