title: Blazor the type or namespace name 'App' could not be found (are you missing a using directive or an assembly reference?)
body: <p>I have setup the basic application in Blazor in Microsoft Visual Studio Community 2019 Version 16.1.3 and I have tried both of the versions of .NET Core SDK 3.0.100-preview5-011568 and SDK 3.0.100-preview6-012264.</p>
  
  <p>Also I have installed the Blazor extension but when I am building without any modification in any files, the build fails with the following error:</p>
  
  <blockquote>
    <p>"The type or namespace "App" could not be found.</p>
  </blockquote>
  
  <p>Any help will be highly appreciated. Thanks.</p>