PageRequestManagerParserErrorException nightmares, fear

Hi all,

I get PageRequestManagerParserErrorException error in my app:

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

It happens when change Drowdownlist, which is in UpdatePanel:

<cc1:DropDownListFilter ID="CboNombreAp" runat="server" 
                                Caption="Nombre Aplicacion:" FirstColumn="True" LastColumn="False" 
                                MarginLeft="15px" MarginTop="10px" Width="200px" 
                                AddBlankItem="True" BlankItemText="--Seleccione Aplicación--" 
                                BlankItemValue="-1" AutoPostBack="True" 
                                onselectedindexchanged="CboNombreAp_SelectedIndexChanged"  ></cc1:DropDownListFilter>
                             <cc1:DropDownListFilter ID="CboNombreSrv" runat="server" AddBlankItem="True" 
                                BlankItemText="--Seleccione Servicio--" BlankItemValue="-1" 
                                Caption="Servicio:" FirstColumn="False" LastColumn="True" 
                                MarginLeft="30px" MarginTop="10px" Width="200px" AutoPostBack="False" 
                            Visible="False" >
                            </cc1:DropDownListFilter>   


 protected void CboNombreAp_SelectedIndexChanged(object sender, EventArgs e)
        {
            DataSet ds = this.gestorCarga.GetOperativasAplicacion(this.CboNombreAp.SelectedValue);

            this.ListBoxOperativas.DataSource = ds;
            this.ListBoxOperativas.DataTextField = "TNOMBRE";
            this.ListBoxOperativas.DataValueField = "NID_TOPERATIVA";
            this.ListBoxOperativas.DataBind();
        }

the page <%@ Page Language="C#" MasterPageFile="~/Nsi.Master" AutoEventWireup="true" CodeBehind="FormConsulta.aspx.cs" Inherits="WebUIEstadisticas.WebUI.FormConsulta" %>

the web.config

    <globalization culture="es-ES" uiCulture="es-ES" responseEncoding="UTF-8" requestEncoding="UTF-8" fileEncoding="UTF-8" responseHeaderEncoding="UTF-8" />

I have seen several page about this issue but not solution for me.

I have this.

No Response.Write

No Output Caching

No Response Filters

No Trace

No Http Module

No Server.Transfer

the error appears every time when change dropdownlist.

Any help will be very very very grateful.

Thanks in advanced.

ansaurus

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PageRequestManagerParserErrorException nightmares, fear

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