How to us Monitor Centre to solve the WARNING: Monitor specification not found. Creating a temporary one

Hello!

I’m trying to solve the warning message I get when I run the experiment: Monitor specification not found. Creating a temporary one…

In the psychopy Monitor Centre I created a Monitor called “ExperimentMonitor” and set the screen dimensions…for a iMac (Retina 4K, 21.5-inch, 2017)

Then in the Experiment Settings I set the monitor to “ExperimentMonitor”

However, I’m still getting the WARNING: Monitor specification not found. Creating a temporary one… Can anyone help on where I going wrong?

Thanks