“Use Legacy Swift Language Version” (SWIFT_VERSION) is required to be configured correctly for targets which use Swift."

Question

Ever since I\'ve updated to Xcode 8.2 (GM seed, from the App Store), I have been stuck at the following error:

Use Legacy Swift Language Version” (SWIFT_V

Answer 1

Just in case anyone else runs into the same issue I just had.

I had an app that was ready to launch onto the app store but i was waiting, meanwhile i updated to Xcode 9 beta and was messing around, changed a few things in my app. I went to upload it to the app store and it said you could not use beta versions to upload so i went back to Xcode 8 but it started giving me the “Swift Language Version” (SWIFT_VERSION)..." error.

My fix

Under your project Build Settings > Swift Compiler Version > I had to change this from Swift 4(currently not supported) to Swift 3.

Problem Solved :)