This error occurs when the Swift version is not specified under Swift Compiler Languge for your project.
All you need to do is, Navigate to Build Settings -> Swift Compiler Language, from the drop down specify the Swift version.
Tweaking Apps
This error occurs when the Swift version is not specified under Swift Compiler Languge for your project.
All you need to do is, Navigate to Build Settings -> Swift Compiler Language, from the drop down specify the Swift version.