In my case, all warn disappeared after I directly changed swift version from 2.x to 4.0 in build settings except...
maybe you need to download toolchain. This error occurs when you don't have right version of swift compiler.
This Solution works when nothing else works: I spent more than a week to convert the whole project and came...
I just click on latest swift convert button and set App target build setting-> Swift language version: swift 4.0, Hope...
This can happen when you added Core Data to an existing project. Check the: <Name>/<Name>.xcdatamodeld/<Name>.xcdatamodel/contents file. This file contains an...
I just got this after creating a new Objective-C project in Xcode 10, after I added a Core Data model...
For Objective C Projects created using Xcode 8 and now opening in Xcode 9, it is showing the same error...
Answer to your question: You can download Xcode 8.x from Apple Download Portal or Download Xcode 8.3.3 (or see: Where...