Ajax Update Panel With Url Rewriting

Hi

I am using asp.net framework 3.5/visual studio 2008/SQL server 2008

I created an aspx page and placed asp.net Gridview control in Ajax update panel with paging functionality.

But I faced a problem when I clicked a second time on paging on GridView then it throws an error :-

"Timestamp: 2/7/2013 12:30:41 PM
Error: Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 404
Source File: http://localhost:1892/SAM/ScriptResource.axd?d=tinj8daIqw37i-foUiBThAyApBA0jKvu87plBrEFhTtKuKzCwSSOH4dyQJirMsUx6xogpRpizJ2RXio3HXoIuiY-6DUmPmoSdWoD2XDRHTrAyGS9Na7H0-5FtjNwaC0GaDSuGq4qc7PWCktOv3nPuu6YZwvgVyquKQquWPxQ2RUhYs9Q0&t=fffffffff9d85fa6
Line: 900"

Due to this none of the functionality working on this Gridview on second clicked (like row command/paging/sorting/etc)

This error came when I took single button under update panel, first time click work fine but second time generated same error above specified error.

Please help me to sort out this issue.

Thanks