aspnetcore: Default Blazor Client App fails throwing the build error[Blazor][Appbuilding]

I am trying to create an ClientSide Blazor app but I am not even able to build the default blazor app present in the VS

C:\Users\anagniho\source\repos\BlazorApp8>dotnet build
Microsoft (R) Build Engine version 16.3.0-preview-19375-05+42c4c1370 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  Restore completed in 30.65 ms for C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj.
  You are using a preview version of .NET Core. See: https://aka.ms/dotnet-core-preview
obj\Debug\netstandard2.0\RazorDeclaration\Pages\_Imports.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\_Imports.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\FetchData.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\FetchData.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Index.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Index.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Counter.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Counter.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]

Build FAILED.

obj\Debug\netstandard2.0\RazorDeclaration\Pages\_Imports.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\_Imports.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\FetchData.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\FetchData.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Index.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Index.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Counter.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttributeAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
obj\Debug\netstandard2.0\RazorDeclaration\Pages\Counter.razor.g.cs(51,38): error CS0234: The type or namespace name 'LayoutAttribute' does not exist in the namespace 'Microsoft.AspNetCore.Components' (are you missing an assembly reference?) [C:\Users\anagniho\source\repos\BlazorApp8\BlazorApp8.csproj]
    0 Warning(s)
    8 Error(s)

Time Elapsed 00:00:01.21

Selecting the server app question resolves the issue though. is there anything else that needs to be installed for making it work ?