Error XamlG and Bundle in my first App

Hi, I'm new in developing with xamarin

I started to develop an app with a Xamarin.Form and obviously I have some problem:

1. Error : The target "XamlG" does not exist in the project. App.Android
2. Error: The name 'bundle' does not exist in the current context. TApp.Android

I already tried on google and I did the following tests :
1. Update the nuget Pack
2. Clean and rebuild the solution

But doesn't work

Someone can help me?

BR