title: ASP.NET Master Page frameworkName: Value cannot be null error
body: <p>I'm going over some ASP.NET tutorials and the first one I'm looking at is how to make a Master Page. When I do create a master page, I get an error:</p>
  
  <pre><code>Value cannot be null.  Parameter name: frameworkName
  </code></pre>
  
  <p>It occurs in the first line of my master page (MasterPage.master) and it's the default page that gets created- I haven't modified it at all:</p>
  
  <pre><code>&lt;%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %&gt;
  </code></pre>
  
  <p>Could somebody tell me what is the <code>frameworkName</code> parameter and how can I get rid of this error?  FYI: I'm using Visual Studio 2010.</p>