Visual Studio 2008 - The requested page cannot be accessed because the related configuration data for the page is invalid

Error

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Microsoft Visual Studio
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Unable to start debugging on the web server.

Server Error

Internet Information Services 7.0

Error Summary

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

Error Summary
HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.

Config Source

   -1:
    0: 

Make sure the server is operating correctly. Verify there are no syntax errors in web.config by doing a Debug.Start Without Debugging. You may also want to refer to the ASP.NET and ATL Server debugging topic in the online documentation.
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OK Help
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Solution
You are using IIS 7.0 on a computer that is running Windows Vista. Additionally, you configure the Web site to use UNC Passthrough authentication to access a remote Universal Naming Convention (UNC) share.The IIS_IUSRS group does not have the appropriate permissions for the ApplicationHost.config file or for the Web.config file.

I have given rights to folder which contains the web.config file. Now it works for me...