Getting permission error when application hosted in iis?

I am using iis version 6.2 . I hosted the ASP.NET application.When i load the hosted link in browser getting HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid..Error code: 0x80070003,Config error:Cannot read configuration file.I gave permission for IUSR to web.config file.Please suggest your solution.

I got solution for this issue. Actually in my web.config file authentication mode set as "Forms".I disabled the Form authentication in iis that is the problem. When i enabled it was working. When we host in iis have to give permission for web.config and enable the authentication(Windows/Forms).