Xcode 9.4.1上传iOS App到App Store 前校验失败

 

SDK Version Issue. This app was built with the ios 11.4 SDK. All ios apps submitted to the App Store

just 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

An unknown error occurred

SDK版本问题。此应用程序是使用iOS 11.4 SDK构建的。所有提交到应用商店的iOS应用程序

只需使用iOS11sdk或更高版本构建，包含在xcode 9或更高版本中。此外，从2019年3月开始

提交到应用商店的所有iOS应用程序必须使用iOS 12.1 SDK或更高版本构建，包含在Xcode中。

10.1或更高版本

发生未知错误