Publish ParentWebsite and Child webSite

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IIS7

ASP.NET

Windows

IIS

Win7

Hi,
I have two websites .
ParenetWebSite (configured to use ASP.NET 2.0 or ASP.NET 3.5)
childwebapp (configured to use ASP.NET 4)

I have hosted these websites on IIS 7 on windows 7
The steps which I have followed
1) Create Application pool for ParenetWebSite which is used framework 2.0
2) With in ParenetWebSite , I havecreated virtual directory childwebapp and create application pool which is used framework 4.0

Now When I access childwebapp. It thows error like

Config Error There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined

<sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
7:         <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
8:         <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

How to resolve this error . My objective is to access both application ParenetWebSite and childwebapp.

Regards,
Rajesh