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Editorial Team
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Asked: 2026-05-15T19:32:44+00:00

I’m going over some ASP.NET tutorials and the first one I’m looking at is

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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:

Value cannot be null.  Parameter name: frameworkName

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:

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

Could somebody tell me what is the frameworkName parameter and how can I get rid of this error? FYI: I’m using Visual Studio 2010.

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  1. Editorial Team

    This is a bug in VS 2010:

    The reason you are seeing this error is that there are assembly references in the xaml which you are failing to resolve. There is a startpage.csproj in the same directory as the .xaml file. Please copy both to the new folder and open the project file in VS 2010. This should work.

    http://connect.microsoft.com/VisualStudio/feedback/details/485162/edit-startpage-xaml-frameworkname-value-cannot-be-null

    Here is master file that I currently have, so I would check for missing assemblies?:

    <%@ Master Language="C#" AutoEventWireup="true" CodeFile="Site.master.cs" Inherits="SiteMaster" %>

    Can you also recreate the solution and import into the new .sln file ?

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