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Migrating app to multi-platform iOS 14/macOS 10.16 - creating new app folder structure?

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I've been working on an app that I started on a few months back with iOS 13 and now I'd like to have it only support iOS 14+ and also be able to build to a macOS app. I updated the checkboxes in the Project file to support macOS and then I created a new app file that includes @main (along with adding the appdelegate mentioned here and I commented out "@UIApplicationMain" in AppDelegate.swift.

Now the build succeeds but instantly crashes for some symbol not found error with the directory mentioning maccatalyst (dyld: Symbol not found: _$s4Body7SwiftUI3AppPTl).

I created a new multiplatform app from scratch and noticed it has a new folder structure: Shared, iOS, macOS. Do I need to manually create this folder structure myself?


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