Psychopy closes immediately

hello

im using psychopy builder in windows 10. i had no such issue before, but i was building an experiment today and after running it a few times, all of a sudden psychopy started to shut down immediately after i skipped the “tips” window.

i tried to delete it and build it again but the same issue happened. i tried restarting my pc but no chance, it persists. it doesnt seem to be a problem with other experiments i built before.
the experiment that raises the problem is a very simple experiment, where i draw a square on the screen and record various keyboard responses, choosing the conditions from an excel file etc. I even barely have a code component in it. Though, the problem first occured when I tried to put a “thisExp = psychoJS.experiment” stuff.

any idea why and how to solve it?

thanks, tutku