problem with script error when session state mode as state server and session

Question

Hi All,

In my application. i am using the session state mode as "state server" we are getting an error while binding the grid with data .Error Message: Sys.Webforms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was : 500

 and when i am changing the mode to "inproc" it is working but when i am using the mode as "inproc" it causes session timeout expiring early.

so please provide an solution when i am using the session mode as state server and the error must be resolved. please is there any way to solve this problem 

Thanks in advance

Thanks and regards

V.S.R.Krishna