Could not find or load main class. See Below. I've reviewed all previous Forum info on this and found no solution. I'm using Xcode 12.3. I'm a new developer and thus do not have Xcode 11.6 to fall back on. How can Apple operate like this? I've had Apple Developer Tech support review this and they claim it is an Apple problem, my program is good. Apple tech person also said they don't know how to help me any further. Ugh! Platform and Version iMac Pro MacOS Big Sur version 11.0.1 IOS “Any IOS Device (arm64)” only choice given in Xcode Xcode version 12.3 SwiftUI version 5 Description of Problem and Steps to Reproduce 1) First some background. The App called “Clock-CranePilates” works on all simulators and works wonderfully on my own iPhone Xs. The Xcode Build and Analyze work great with no errors. The Product/archive/Validate App works successfully. 2) The problem is when trying to distribute the App using Xcode Product/archive/Distribute App. This fails with the following message: App Store Connect Operation Error Could not find or load main classLibrary.Java.Extensions:.Library.Java.Extensions:.Network.Library.Java.Extensions:.System.Library.Java.Extensions:.usr.lib.java:. Any help on this will be truly appreciated.