Could not AOT the assembly of my App

Question

Could not AOT the assembly of my App

David Perera 11

Hello,

I have an app written in xamarin forms, targeting xamarin.android and xamarin.iOS. Since the UIWebView deprecation https://devblogs.microsoft.com/xamarin/uiwebview-deprecation-xamarin-forms/, I have upgraded my app from Xamarin Forms 3.0 to Xamarin.Forms 5.0.

Now I get the following error when deploying in Release for AppStore (in debug everything works fine since the compilation is JIT):

C:\cicdev\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(421,3): error MT3001: Could not AOT the assembly '/Users/idboxrt/Library/Caches/Xamarin/mtbs/builds/IDboxMobile.iOS/e86aa7b5295e9875bca66b5cd69c66e6eb0c2469c92d74f31f9c313ee00733b4/obj/iPhone/ReleaseTemp/mtouch-cache/3-Build/IDboxMobile.dll'

IDboxMobile.dll is the dll of my NetStandard shared application which targets my IDboxMobile.iOS target.

I attach the log in a .zip (please change the .txt to .zip in the attached file)

I have updated xamarin.iOS, xcode and visual studio to their latest versions today. Thge Supported Architecture is ARM64. I tried to change the linker options, LLVM, Enable Mono Interpreter, and so on.

Also put the verbosity of the log attached in "-v -v -v -v", but I cannot get more info about the AOT, just that it fails.

Thank you very much in advance.

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Answer 1

JarvanZhang 23,971

Hello,

Welcome to our Microsoft Q&A platform!

IOS applications have had a number of limitations when running on a device. Even using Ahead of Time” (AOT), It can also restrict a number of C# features from being used. To avoid this, try using the interpreter function.

Check the tutorial: https://devblogs.microsoft.com/xamarin/introducing-xamarin-ios-interpreter/

Someone faced the similar problem and solved the issue by configuring the MtouchExtraArgs tag.

   <MtouchExtraArgs>--interpreter=the_assembly ...</MtouchExtraArgs>  
   <MtouchInterpreter>-all</MtouchInterpreter>  
     
   //or  
   <MtouchExtraArgs>--linkskip=the_assembly  ...</MtouchExtraArgs>

Please check: https://stackoverflow.com/a/65809789/11083277

Best Regards,

Jarvan Zhang

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David Perera 11 Reputation points

2021-05-17T09:40:19.047+00:00

I tried before the check of "Enable Mono Interpreter", and I though that it was doing everything with the interpreter. When I did mark that option the <MtouchInterpreter>-all</MtouchInterpreter> was put in the .csproj.

Today I previously had downgrade Xamarin.Forms 4.5, and the same error ocurred.

I tried now to put also the MTouchExtraArgs argument if -interpreter=IDboxMobile, and it worked.

But, I just delivered the .ipa to the store and tried on test mode, and it crashes

I could see this line of log in the iphone:
May 17 11:57:01 iPhone-de-IDbox IDboxMobileiOS[630] <Notice>: error: * Assertion at /Users/builder/jenkins/workspace/archive-mono/2020-02/ios/release/mono/mini/aot-runtime.c:1838, condition `data' not met

Maybe we just moved the error to runtime?

Thanks again!

Kind Regards
JarvanZhang 23,971 Reputation points

2021-05-18T08:55:05.35+00:00

Please check the related code about the 'data'. Did you use the dynamic keyword in your project. Someone face the similar problem which is caused by the dynamic keyword. Please check: https://stackoverflow.com/questions/56561677/condition-klass-not-met-when-loading-my-page
David Perera 11 Reputation points

2021-05-19T06:28:11.713+00:00

Thanks for your reply.

I finally did not use the interpreter option and I discover that was Xamarin.Auth library which I compile manually with the trinngunyen branch (for removing UIWebView references): https://github.com/xamarin/Xamarin.Auth/pull/443

But something in that code was provoking the AOT problem. So, when I realized this I downloaded the master branch and modified myself to remove the UIWebview references. Then I build and import the dll manually, and the AOT problem was gone.

Thank you very much for your effort.
JarvanZhang 23,971 Reputation points

2021-05-19T06:33:00.92+00:00

Congrats! And Thanks for sharing the solution.
Luca Ziegler 11 Reputation points

2023-10-12T16:37:45.1266667+00:00

You solution worked with Microsoft.Graph and Xamarin Forms iOS

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Could not AOT the assembly of my App

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