首先附上错误信息及截图
App Store Connect Operation Error
ERROR ITMS-90534: "Invalid Toolchain. Your app was built with an unsupported version of Xcode or SDK. If you plan to submit this build to the App Store, make sure you are using the GM version of Xcode 10.1 and the SDK for iOS 12.1 and watchOS 5.1, Xcode 7.1 and the SDK for tvOS 9, or Xcode 6 and the SDK for macOS 10.9 or later. If you are using an Xcode beta version to test your app, make sure you are using the latest supported version. For more information about supported beta versions, view the App Store Connect What's New page (https://developer.apple.com/app-store-connect/whats-new/)."
App Store Connect Operation Warning
WARNING ITMS-90703: "Deprecated Xcode Build. Due to resolved app archives issues, we have deprecated Xcode 11.2 on November 5, 2019. Download Xcode 11.2.1 or newer, rebuild your app and resubmit."
解决方案就是：将xcode更新到最新（即错误提示的所要求的版本即本错误的xcode11.2.1版本），然后重新打包上传；
注意：如果从App Store看不到更新的版本，那么就从苹果开发者官网去下载最新的xcode（macOS、iOS等苹果的最新软件系统都在此可以下载），具体原因可能是测试版或者App Store数据同步问题吧；
下载完成然后解压什么的大概需要2个小时左右（具体忘记了），然后就可以用最新的xcode版本打包上传了！
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