Up until yesterday, 8/13/2018, I was able to upload test builds to the app store to use with Testflight. However, starting yesterday, I no longer could and am recieving the following error:
ERROR ITMS-90534: "Invalid Toolchain. New apps and app updates must be built with the public (GM) versions of Xcode 9 or later, macOS, and iOS SDK or later. Don't submit apps built with beta software including beta macOS builds."
Previously, this used to be a warning or would not show up at all. Has anyone else run into this problem? What is the work around? I need to be able to test our iOS 12 features, but can't do so anymore.