title: The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found
body: <p>I tried to upgrade my web app from .net core 2.0 to .net core 2.1
  I did:</p>
  
  <p>1) Install Visual Studio Professional 2017 Preview Version 15.8.0 Preview 1.1<br>
  2) Installed the .net core 2.1.3 RC1 SDK from here: <a href="https://www.microsoft.com/net/download/dotnet-core/sdk-2.1.300-rc1" rel="noreferrer">https://www.microsoft.com/net/download/dotnet-core/sdk-2.1.300-rc1</a><br>
  3) Updated all of my aspnetcore nuget packages to the latest version.    </p>
  
  <p>After doing both of these things, when I start my project I get this screen:</p>
  
  <blockquote>
    <p>HTTP Error 502.5 - Process Failure Common causes of this issue:</p>
  
  <pre><code>The application process failed to start
  The application process started but then stopped
  The application process started but failed to listen on the configured port 
  </code></pre>
    
    <p>Troubleshooting steps:</p>
  
  <pre><code>Check the system event log for error messages
  Enable logging the application process' stdout messages
  Attach a debugger to the application process and inspect 
  </code></pre>
    
    <p>For more information visit:
    <a href="https://go.microsoft.com/fwlink/?LinkID=808681" rel="noreferrer">https://go.microsoft.com/fwlink/?LinkID=808681</a></p>
  </blockquote>
  
  <p>and in my Output window from ASP.NET Core Web Server, I get this:</p>
  
  <pre><code>The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found.
    - Check application dependencies and target a framework version installed at:
        C:\Program Files\dotnet\
    - Installing .NET Core prerequisites might help resolve this problem:
        http://go.microsoft.com/fwlink/?LinkID=798306&amp;clcid=0x409
    - The .NET Core framework and SDK can be installed from:
        https://aka.ms/dotnet-download
    - The following versions are installed:
        2.1.0-preview2-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
        2.1.0-rc1-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  It was not possible to find any compatible framework version
  The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found.
    - Check application dependencies and target a framework version installed at:
        C:\Program Files\dotnet\
    - Installing .NET Core prerequisites might help resolve this problem:
        http://go.microsoft.com/fwlink/?LinkID=798306&amp;clcid=0x409
    - The .NET Core framework and SDK can be installed from:
        https://aka.ms/dotnet-download
    - The following versions are installed:
        2.1.0-preview2-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
        2.1.0-rc1-final at [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  </code></pre>