Cannot preview in this file - active scheme does not build this file : SwiftUI on Xcode 11 in CatalinaOS

Question

I opened Landmark App using SwiftUI on Xcode 11 in macOS Catalina(10.15) and while opening the Canvas Editor for .swift files containing SwiftUI is showing

Answer 1

I encountered the same error for some of my SwiftUI View files when trying to preview on Canvas. What fixed the issue was I copied the code within the current file, deleted the file, created a new SwiftUI View file under the same name and pasted the original code. Hope that helps!

Creating a new folder in Documents/Desktop and copying the files over also resolves the issue.