Xcode 10.2 Invalid Toolchain - Your app was built with a beta version of Xcode or SDK. Apps submitted to the App Store must be built with the GM version of Xcode 9 and the SDK for iOS 11, tvOS 11, watchOS 4, or macOS 10.13 or later.
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I've updated to latest stable releases of Mojave and Xcode, but also keep getting these annoying messages from Team Apple.
Btw, I found two solutions: • delete Xcode and move back manually to previous version (which is 10.1 now) • manually change some config files to fool the review process (Apple will think that you're using old Xcode and/or old macOS)
Update: I asked many experienced developers about that and all of them said "just wait".
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Update 2 (27.03.2019): AppStore took a dump so everything now seems to be fine.

Sergey V.
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Downgrading Xcode to 10.1 helped me
- Go https://developer.apple.com/download/more/
- Find and download Xcode 10.1.
- Double-click to unpack.
- Remove old Xcode from Applications and paste this one instead.
- Build your artifact

damienix
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