[FIXED] "The XamarinTelemetry task failed unexpectedly" on second build

Issue

With the latest VS preview (VS 17.3 Preview 3), with both Android and iOS, building my application works the first time I build it, but the second time it fails with

The "XamarinTelemetry" task failed unexpectedly.

Looking at the logs I see this:

1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: The "XamarinTelemetry" task failed unexpectedly.
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: System.IO.FileNotFoundException: Could not load file or assembly 'Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The system cannot find the file specified.
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: File name: 'Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed'
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Microsoft.VisualStudio.Telemetry.TelemetrySessionSettings.GetFaultEventBucketFilterJson(List`1 bucketFilters)
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Microsoft.VisualStudio.Telemetry.TelemetrySessionSettings.ToString()
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Microsoft.VisualStudio.Telemetry.TelemetrySession.SerializeSettings()
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Xamarin.Common.Tasks.Telemetry.GetSession(IBuildEngine4 buildEngine, String vsTelemetrySession) in D:\a\_work\1\s\src\MSBuild\Xamarin.Common.Tasks\Telemetry.cs:line 62
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Xamarin.Common.Tasks.XamarinTelemetry.Execute() in D:\a\_work\1\s\src\MSBuild\Xamarin.Common.Tasks\XamarinTelemetry.cs:line 31
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: 
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: WRN: Assembly binding logging is turned OFF.
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: Note: There is some performance penalty associated with assembly bind failure logging.
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018: To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].
1>C:\Program Files\Microsoft Visual Studio\2022\Professional\MSBuild\Xamarin\Xamarin.Sdk.targets(138,9): error MSB4018:

The only workaround I’ve found is to clean the entire solution and rebuild, which succeeds, but then fails again the next time I try to build.

Has anyone found a solution to this?

Solution

First off, don’t shoot the messenger here..

As per the workaround thread on Visual Studio’s dev community thread:

  1. Open, Xamarin.Sdk.targets in Admin Mode (I use, Notepad++)
    • C:\Program Files\Microsoft Visual Studio\2022\Preview\Msbuild\Xamarin\Xamarin.Sdk.targets
  2. Comment out the <XamarinTelemetry ... />
  3. Save file and rebuild the solution.

Though it does work in the interim, please forward your official feedback on the official VS Developer Community thread in the link below.

Answered By – Damian

Answer Checked By – Laura B. (Easybugfix Admin)

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