新安装Xcode 9.2 (9C40b)，上传app到App Store时报错：
ERROR ITMS-90534: "Invalid Toolchain. New apps and app updates must be built with the public (GM) versions of Xcode 6 or later, macOS, and iOS SDK or later. Don't submit apps built with beta software including beta macOS builds."
这个可能是Xcode 9.2的bug。苹果的开发者论坛Xcode 9.2 app uploading broken?给出了一个可能的解决方案：
Right-Click on the archive file (.xcarchive) > Show Package Contents > Products > Applications > Right-Click on the app file > Show Package Contents > Double-Click on Info.plist to edit it
Change value of DTXcodeBuild from 9C40b to 9C40