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Resolving a “There is a duplicate ‘system.web.extensions/scripting/scriptResourceHandler’ section defined” Error

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People get this error a lot when upgrading an ASP.NET 2.0 application to ASP.NET 4.0.

Here is a link to common ASP.NET 4 Breaking Changes:
http://www.asp.net/learn/whitepapers/aspnet4/breaking-changes#0.1__Toc256770149




And here is the section that applies to this error:
“The workaround for the second scenario is to delete or comment out all the system.web.extensions configuration section definitions and configuration section group definitions from the application-level Web.config file. These definitions are usually at the top of the application-level Web.config file and can be identified by the configSections element and its children.”

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2 comments on “Resolving a “There is a duplicate ‘system.web.extensions/scripting/scriptResourceHandler’ section defined” Error”

  1. shay says:
    May 10, 2012 at 11:07 am

    brilliant, deleting out the system.web.extensions config section fixed this for me!

  2. Maulin says:
    January 22, 2013 at 6:48 am

    I installed following and it solved my error

    http://www.iis.net/downloads/microsoft/url-rewrite

    http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=6576

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