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Does this happen on all files or is there a file that seems to be tripping it up?
It happens when without opening any file, I go to File>Automate>Contact Sheet II on an iMac with macOS Catalina
Let's make sure we're in a default state and there are no stale settings somewhere:Restore your preferences using this manual method: https://helpx.adobe.com/photoshop/using/preferences.html#Manually Does it work correctly?If that doesn't solve it, you can quit Photoshop and put the Settings folder back.
If restoring prefs doesn't fix it, we'll need to see what setting you have in the Contact Sheet dialog when you get the error:
Resetting preferences doesn't work, I get the error when clicking Contact sheet II button, I don't get the settings dialog I just get the error