I'm receiving "Section or group name 'system.web.extensions' is already defined" error after install

Martin Dobsicek asked on November 30, 2009 10:45

I'm receiving "Section or group name 'system.web.extensions' is already defined" error after installation

installation

Correct Answer

Martin Dobsicek answered on November 30, 2009 10:45

This issue is most probably caused by Kentico CMS site has been put into sub-directory of another web site and is inheriting web.config setting from parent folder. If you use same version of 'system.web.extensions' library in parent folder, you can just remove following line from web.config file of Kentico CMS site:
<sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">

Otherwise you can change following lines:
<configSections>
        <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">

to:
    <configSections>
        <clear/>
        <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">

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