Errore in visual studio xamarin when create project get error

hello  my dears  
please help  me   

I just started learning Xamarin and I am having some problems. I created a new Android App Project, using a Single View App ,tapped or blank. I just open the activity_main.axml using the solution explorer and after it loads, i get the following error: "This project contains resources that were not compiled successfully, rendering might be affected." Even if I try to rebuild the solution, the error persists. Worth mentioning: this happens without editing/writing any code and without adding any objects through the toolbox. Any ideas? Thanks!

error is 
"this project contains resources that were not compiled successfully rendering might be affected" 








my  vs info copy is 


Microsoft Visual Studio Community 2017 
Version 15.7.5
VisualStudio.15.Release/15.7.5+27703.2042
Microsoft .NET Framework
Version 4.7.03056

Installed Version: Community

Visual C++ 2017   00369-60000-00001-AA952
Microsoft Visual C++ 2017

Application Insights Tools for Visual Studio Package   8.12.10405.1
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2017   15.0.40625.0
ASP.NET and Web Tools 2017

ASP.NET Core Razor Language Services   15.7.31476
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2012   4.0.21208.0
For additional information, visit https://www.asp.net/

ASP.NET Web Frameworks and Tools 2017   5.2.60618.0
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0   15.0.40608.0
Azure App Service Tools v3.0.0

Azure Functions and Web Jobs Tools   15.0.40608.0
Azure Functions and Web Jobs Tools

C# Tools   2.8.3-beta6-63029-08. Commit Hash: e9a3a6c0ba5b1fde8b1fff964bdfb3fb768ee2eb
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

JavaScript Language Service   2.0
JavaScript Language Service

JavaScript Project System   2.0
JavaScript Project System

JavaScript UWP Project System   2.0
JavaScript UWP Project System

Merq   1.1.19-rc (a4ffc1b)
Command Bus, Event Stream and Async Manager for Visual Studio extensions.

Microsoft Azure Tools   2.9
Microsoft Azure Tools for Microsoft Visual Studio 2017 - v2.9.10420.2

Microsoft Continuous Delivery Tools for Visual Studio   0.3
Simplifying the configuration of continuous build integration and continuous build delivery from within the Visual Studio IDE.

Microsoft JVM Debugger   1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards   1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio Tools for Containers   1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

Mono Debugging for Visual Studio   4.10.5-pre (ab58725)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager   4.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

ProjectServicesPackage Extension   1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

ResourcePackage Extension   1.0
ResourcePackage Visual Studio Extension Detailed Info

SQL Server Data Tools   15.1.61804.210
Microsoft SQL Server Data Tools

TypeScript Tools   15.7.20419.2003
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools   2.8.3-beta6-63029-08. Commit Hash: e9a3a6c0ba5b1fde8b1fff964bdfb3fb768ee2eb
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.1 for F# 4.1   15.7.0.0.  Commit Hash: 173513e369ffb7a1c4d5dccf83696d9aac2ab2d0.
Microsoft Visual F# Tools 10.1 for F# 4.1

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Tools for Universal Windows Apps   15.0.27703.2042
The Visual Studio Tools for Universal Windows apps allow you to build a single universal app experience that can reach every device running Windows 10: phone, tablet, PC, and more. It includes the Microsoft Windows 10 Software Development Kit.

VisualStudio.Mac   1.0
Mac Extension for Visual Studio

Windows Machine Learning Generator Extension   1.0
Windows Machine Learning Visual Studio Extension Detailed Info

Xamarin   4.10.10.2 (35a01d8dc)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer   4.12.1 (f3257e429)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin.Android SDK   8.3.3.2 (HEAD/dffc59120)
Xamarin.Android Reference Assemblies and MSBuild support.

Xamarin.iOS and Xamarin.Mac SDK   11.12.0.4 (64fece5)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.