I keep getting this message: ERROR ITMS-90725: "SDK Version Issue. This app was built with the iOS 11.4 SDK. All iOS apps submitted to the App Store must be built with the iOS 11 SDK or later, included in Xcode 9 or later. Further, starting March 2019, all iOS apps submitted to the App Store must be built with the iOS 12.1 SDK or later, included in Xcode 10.1 or later."
Is that something on Gamesalad's end, that they are not up to date on? My iMac is up to date, as well as my XCode.