Unrecognized configuration section in Asp.net

I am receiving following errors In  web.config file  using VS2010  (.net framework 4.0)
1.Unrecognized configuration section system.web/add
2. The element 'system.web' has invalid child element 'defaultDocument'
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=75BF384334AD364E35"/>

Open in new window

prashanth agsoftware engineer Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Dan McFaddenSystems EngineerCommented:
The 'defaultDocument' element is a child of system.webServer configuration section.

<?xml version="1.0" encoding="UTF-8"?>
                <clear />
                <add value="index.html" />
                <add value="default.aspx" />
                <add value="Default.asp" />
                <add value="index.htm" />
                <add value="Default.htm" />

Open in new window

Dan McFaddenSystems EngineerCommented:
Rainer JeschorCommented:
the add tagPrefixes should be in a controls element under the pages element.

The resulting part (!!!) should look like this:
<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
		<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
		<add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

Open in new window

Extend you pages element, add a node "controls" inside and move the two "add tagPrefix" elements into the new node.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Web Development

From novice to tech pro — start learning today.