I want to access my asp.net project using IP address

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SQL-Server-2005

ASP.NET

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Dear Sir,

I developed a web application it is working fine on local system,Now i want to access it on intranet(using IP address).for that i published it in C:\inetpub\wwwroot\published and in IIS i created a virtual directory named su. and also add ASPNET and IIS_IUSRS account and gave all the permissions.
When I browse it then i get a following error-

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.
Detailed Error Information
Module
IIS Web Core
Notification
Unknown
Handler
Not yet determined
Error Code
0x80070032
Config Error

The configuration section <system.web.extensions> cannot be read because it is missing a section declaration
Config File

\\?\C:\inetpub\wwwroot\web.config

Requested URL

http://localhost:80/su

Physical Path
Logon Method

Not yet determined
Logon User

Not yet determined
Config Source   25:     
   26:  <system.web.extensions>
   27:      <scripting>


 Links and More Information This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.
View more information.

PLS HELP ME .

THANKs
Abhishek