sys.web.forms.page.request manager PaserError exception

Question

hai friends

<%@ Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" MasterPageFile="~/Transaction.master" CodeFile="TJFAS109.aspx.cs" Inherits="TJFAS109" %>

<%@ Register TagPrefix="Teja" TagName="DateTime" Src="~/UserControl/DateSelector.ascx" %>

function GetValueTJFS109() { __doPostBack('',''); }

........................ //some controls ......................... I am using this source code for me

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Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.

Details: Error parsing near ='ja'

i have not done any changes in the coding part pls help me