提交到使用iOS 12.1 SDK构建的应用商店

在二月份(也许更早一点),我在尝试部署到iTunes时收到了一个警告。警告如下

SDK Version Issue - This app was built with the iOS 11.4 SDK. 
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

到目前为止,我所尝试的一切都不起作用。

因此,我在构建步骤之前添加了Bash脚本步骤,并在脚本中添加了以下两行

sudo $AGENT_HOMEDIRECTORY/scripts/select-xamarin-sdk.sh 5_16_0
echo '##vso[task.setvariable variable=MD_APPLE_SDK_ROOT;]'/Applications/Xcode_10.1.app;sudo xcode-select --switch /Applications/Xcode_10.1.app/Contents/Developer

我发现以前的脚本和指南 https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops&tabs=yaml&viewFallbackFrom=vsts#xcode 构建成功,但部署到iTunes失败,出现错误

ERROR ITMS-90596: "Invalid Bundle. The asset catalog at 'Payload/MyApp.iOS.app/Assets.car' can't be processed. Rebuild your app, and all included extensions and frameworks, with the latest GM version of Xcode and resubmit."

在添加Bash脚本步骤之前,我在iTunes部署中没有遇到这个问题。

所以我想问题很明显我做错了什么?