Xamarin.iOS : “Failed to compile the generated registrar code” on Visual Studio for Mac

If you have recently upgraded your XCode version to 14.0, and installed the XCode command line tools too, you will probably notice some error messages when trying to run your Xamarin.Forms, or iOS application from Visual Studio for Mac.

Error MT4109: Failed to compile the generated registrar code.

What actually helped me, is this:
Navigate to https://developer.apple.com/download/all/ and search for Command Line Tools for Xcode 13.4 and Xcode 13.4. Both downloads are big, the XCode itself around 10GB and the CL Tools are around 1GB, so definitely do not do this on metered connections.

Once the downloads are ready, open the XCode.XP file with the Package Archiver, let it extract to downloads, then move it to Applications folder.

After that, install CL tools. Follow the installer’s instructions.

Boom, it’s solved. Issue reported at: https://github.com/xamarin/xamarin-macios/issues/15954

Xamarin.UWP: Image from embedded resource throws “Operation is not supported on this platform” error

If you are getting the error “Operation is not supported on this platform” when you are trying to set an ImageResource from file for an image on Xamarin.UWP, then the problem comes from this line of code:

IconSource = ImageSource.FromResource("afolder.animage.jpg");

The solution: Image as Embadded Ressource shows “operation is not supported on this platform” in UWP and Release (microsoft.com)
In a short brief: You need to use the second parameter for FromResource method call. You must pass an assembly in order to success on UWP platform. iOS and Android is not affected with this error.

IconSource = ImageSource.FromResource("afolder.animage.jpg", typeof(AClassFromTheAssembly).Assembly);
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Xamarin.Forms: ‘MSBuild:UpdateDesignTimeXaml’ code generator crashed solution

If you are facing an issue after updating the Xamarin.Forms version in your project, with the following error:

SOMEXAMLFILE.xaml: Error: The 'MSBuild:UpdateDesignTimeXaml' code generator crashed: Not connected
  at MonoDevelop.Core.Execution.RemoteProcessConnection.PostMessage (MonoDevelop.Core.Execution.BinaryMessage message, System.Threading.Tasks.TaskCompletionSource`1[TResult] cs, System.Boolean checkInitialized) [0x000c3] in /Users/builder/azdo/_work/2/s/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Execution/RemoteProcessConnection.cs:438 
  at MonoDevelop.Core.Execution.RemoteProcessConnection.SendMessage (MonoDevelop.Core.Execution.BinaryMessage message) [0x00031] in /Users/builder/azdo/_work/2/s/main/src/core/MonoDevelop.Core/MonoDevelop.Core.Execution/RemoteProcessConnection.cs:385 
  at MonoDevelop.Projects.MSBuild.RemoteBuildEngineManager+<>c__DisplayClass20_0.<GetBuildEngine>b__5 () [0x00252] in /Users/builder/azdo/_work/2/s/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.MSBuild/RemoteBuildEngineManager.cs:323 
  at MonoDevelop.Projects.MSBuild.RemoteBuildEngineManager.GetBuildEngine (MonoDevelop.Core.Assemblies.TargetRuntime runtime, System.String minToolsVersion, System.String solutionFile, System.String group, System.Object buildSessionId, System.Boolean setBusy, System.Boolean allowBusy) [0x0036f] in /Users/builder/azdo/_work/2/s/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.MSBuild/RemoteBuildEngineManager.cs:273 
  at MonoDevelop.Projects.MSBuild.RemoteBuildEngineManager.GetRemoteProjectBuilder (System.String projectFile, System.String solutionFile, MonoDevelop.Core.Assemblies.TargetRuntime runtime, System.String minToolsVersion, System.Object buildSessionId, System.Boolean setBusy, System.Boolean allowBusy) [0x000df] in /Users/builder/azdo/_work/2/s/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.MSBuild/RemoteBuildEngineManager.cs:176 [...]

Then clean your solution, and restart Visual Studio for Mac.

This content has 9 months. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.

Xamarin.UWP deployment failure: 0x80073D1F

Registering the application to run from layout...
DEP0700: Registration of the app failed. [0x80073D1F] 
	DeploymentSucceeded = False
	DeploymentError = Err_Deploy_Register
	DeploymentUserError = False
	DeploymentHRESULT = 2147958047
	HasSharedCode = False
	Target.Id = 512
	ProjectGuid = {5894aed2-9bb1-434b-8b49-3b86572709b7}
	Project.TargetPlatformVersion = 10.0.19041.0
	Project.TargetPlatformMinVersion = 10.0.17763.0
Deleting file "vs.appxrecipe" from layout...
DeployAsync: END (Failure, 0:00:01.499)
Deploy: END (Failure, 0:00:01.5)

Solution

Remove your application source code from shared folder
or
You are being signed in with my Microsoft account in windows instead of the local user account
or
Visual Studio is not able to delete the application data in your local packages folder, go to C:\Users\<YOURNAME>\AppData\Local\Packages\ folder, and delete your applications folder manually.
or
browse more solution at here
🙂

This content has 10 months. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.

dotnet tool/workload installation fails, because of custom NuGet sources

If you are facing this issue when using dotnet’s workload install, or tool install:

Workload installation failed: Unable to load the service index for source https://pkgs.dev.azure.com/SourceNAME/_packaging/ProjectName/nuget/v3/index.json.

Then you probably should invoke the command with the following parameter:

--ignore-failed-sources

Hope this helps 😉

This content has 11 months. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.