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Asked: 2026-05-10T19:19:46+00:00

I am migrating web apps to new hosting servers, but when I try to

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I am migrating web apps to new hosting servers, but when I try to access them to test on the new server, I get all these assemblies not found errors like:

Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.  Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.  Source Error:  Line 28:        <compilation debug='false'> Line 29:            <assemblies> Line 30:                <add assembly='System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'/> Line 31:                <add assembly='System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A'/> Line 32:                <add assembly='System.Web.Extensions.Design, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35'/>

Does anyone know where you find these to install or how to migrate them over?

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1 Answer

  1. That’s part of the ASP.Net AJAX kit.

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