Hi,
I also faced such error while tried to run my iOS app as the Mac app (converted by Catalyst).
I resolved this by lowing the Target version of iOS.
Initially I created an iOS app for Target iOS 13.7 and the Mac required macOS 10.15 (I'm running on Catalina 10.15.3).
Running the Mac app with these configurations failed with the error you mentioned.
Reducing the Target to iOS 13.0 solved the issue.
Your app -> TARGETS -> General -> Deployment Info -> Target
valentim
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