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Asked: 2026-06-13T18:42:22+00:00

I am in the process of converting quite a few .NET 2 ASP.NET web

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I am in the process of converting quite a few .NET 2 ASP.NET web apps to .NET 4. One of the problems I’ve encountered during this process is the following error message – 

Could not load file or assembly 'Microsoft.Scripting.ExtensionAttribute, Version=0.9.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

The error also highlights the line of code which is the culprit, which for me, in my ScriptManager – 

<asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server">
</asp:ScriptManager>

The strange thing I’ve noticed is that this error simply disappears as soon as the page is refreshed, but will reappear if I recycle the application pool (and I’m guessing if I publish the web app again).

Most of my research has lead to dead ends, which mostly point the finger of blame to Umbraco (which is not being used at all) and IronPython (which I admit, is used in another project in the same solution, but not the project in question).

I can’t really have these web apps breaking every time I make a change to the site, does anyone have any ideas?

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  1. Editorial Team
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