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Resolved issue by uninstalling XCode like so:Delete XCode from Applications folderEmpty TrashNavigate to ~/Library, then find Developer folder. If XCode coding is all you do, then delete entire folder. I do dev in XCode but also Xamarin, so I went in Developer folder and deleted all folders that don't have "Xamarin" in their names. These are CoreSimulator, XCode, XCTestDevices.Empty TrashNavigate to ~/Library/Caches/ and look for folder com.apple.dt.XCode and delte this folderEmpty TrashRestart MacBookProGo to AppStore and download XCode and install it again.After this, I was able to build and run my app again and it would launch simulator and deploy my app onto it.

I am having same issueXCode Version = 11.3.1 (11C504)Catalina OS Version = 10.15.3 (19D76)

I am having the same problem and it started happening couple of days ago when XCode update to 11.3.1 (11C504) happened.Before that, I was on previous version of XCode 11.3.1 (11C29) and I havent had any issues.Currently onCatalina 10.15.2XCode 11.3.1 (11C504)I originally thought is is Google Chrome since I noticed after opening few tabs in Chrome, everything would freeze. But meanwhile, I stopped using Chrome and I see now that when I build and start my project, it just freezes and crashes eventually my machine.Of course, I cannot say for sure it is XCode but that is the only thing that changed on my machine since it started happening. But I am new to using Mac and developing on it so I am looking to ways how to ID the culprit and how to fix it.