Thank you so much for your advice!
Unfortunetly, I couldn’t find a folder called .psychopy3/ on my computer.
However, it seems like we can find hidden files here!
Finder > Go > press option or alt key (to show Library) > Library > Preferences
and I deleted a file called org.opensciencetools.psychopy
Then, somehow it started working!
Also on the PsychoPy Builder, instead of logging in from the Pavlovia.org button at the top of the screen, it works better if we log-in from the Builder menu!!
I hope this information helps somebody in the future !