How to fix “SWIFT_VERSION '3.0' is unsupported, supported versions are: 4.0, 4.2, 5.0” error in Xcode 10.2?

Question

I\'m trying to run downloaded from app, try to open in Xcode and have an error:

\" Showing Recent Messages
:-1: SWIFT_VERSION \'3.0\' is unsu

Answer 1

I opened up the file MyProject.xcodeproj (using VSCode editor)

and I found some lines where

SWIFT_VERSION = 3.0;

(at about line 400 where it says /* Begin XCBuildConfiguration section */)

Modify to SWIFT_VERSION = 5.0 or others. After that I was able build and run the project.