热门在编译Xamarin.Forms项目时修复'VerifyVersionsTask'错误

Question

After creating a project from scratch using Xamarin.Form and after updating all the libraries (nuget packages) When compiling gives the following error:

Unexpected task error "VerifyVersionsTask"

1. Create new blank Xamarin project
2. Update to the latest nuget packages (all them)
3. Try to build the project but it failes with the following error:

Error The “VerifyVersionsTask” task failed unexpectedly.” “System.TypeInitializationException: The type initializer for 'Xamarin.Android.Support.BuildTasks.NugetPackages' threw an exception. —> System.ArgumentException: An item with the same key has already been added.

Build should run without error.

Answer 1

Please see this tweet

Sorry folks we have delisted 28.0.0.2 for the time being. Please revert back to 28.0.0.1 until we can resolve and release an update

You probably installed the Xamarin.Android.Support.* libraries with version 28.0.0.2 which is flawed and retracted. Revert to 28.0.0.1 for now.

Also see the related issue on GitHub for this error message and the progress.