Deploying .NET Site Error / Section Or Group Name 'system.web.extensions' Is Already Defined?

Sep 3, 2010

I have written my ASP.NET web site code in Visual Studio 2008. When I'm uploading it to the remote server I'm getting an error message about a problem in the web configuration file:

Section or group name 'system.web.extensions' is already defined.Updates to this may occur at the configuration level where it is defined.What is the reason for this error?

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We are working on a web application and the target deployment includes Windows 2003 64-bit. When we run the application on the 64-bit OS, it gives the following error:

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Exception Details: System.TypeLoadException: Could not load type 'System.Web.UI.ScriptReferenceBase' from assembly 'System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Source Error:[Code]....

Stack Trace: [Code]....

[TypeLoadException: Could not load type 'System.Web.UI.ScriptReferenceBase' from assembly 'System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.]
AjaxControlToolkit.ToolkitScriptManager.OnResolveScriptReference(ScriptReferenceEventArgs e) in [code]...

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One of the libraries I am including in my project makes use of System.Web.Extensions, which conflicts with my Framework 2.0 application, which uses (C:Program FilesMicrosoft ASP.NETASP.NET 2.0 AJAX Extensionsv1.0.61025System.Web.Extensions.dll). I can think of 3 possible solutions:

Ignore the warning and don't change anything. I am not sure what the application does to handle this.
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Server Error in '/IMGcup' Application.

Configuration Error
Description: An error occurred during
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Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The
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Source File: C:inetpubwwwrootIMGcupweb.config Line: 24 Assembly Load Trace: The following information can be helpful to determine why the assembly 'System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded.


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