Error sys is undefined

[Aniket]

I am following this tutorial here and created a page but popup won't show when I click the button. I am getting javascript error sys is undefined. 

Tutorial: http://demos.telerik.com/aspnet-ajax/window/examples/modalpopup/defaultcs.aspx

aspx

 

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="FNA.NRTT.Website.Customer.Portfolio.Default" %>
<%@ Register TagPrefix="nrtt" TagName="CustomerGrid" Src="~/UserControls/CustomerGrid.ascx" %>
<%@ Register TagPrefix="nrtt" TagName="DisplayClientDefinedField" Src="~/UserControls/DisplayClientDefinedField.ascx" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="FeaturedContent" runat="server">
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="MainContent" runat="server">
    <h2><asp:Literal ID="ltPageTitle" runat="server" Text="<%$ Resources:NrttLanguage, Portfolio %>"></asp:Literal></h2>
    <nrtt:DisplayClientDefinedField runat="server" ID="ucDisplayCDFS" OnNeedCdfDefinitions="ucDisplayCDFS_NeedCdfDataDefinition" OnFilterChanged="ucDisplayCDFS_FilterCDFS"/>
    <asp:Button ID="rbEdit" Text="Edit" runat="server"/>
    <nrtt:CustomerGrid ID="ucExpiringRealServices" runat="server" AllowSelection="true" OnNeedDataSource="ucExpiringRealServices_NeedDataSource" OnNeedColumnCollection="ucExpiringRealServices_NeedColumnCollection" OnItemDataBound="ucExpiringRealServices_ItemDataBound" ></nrtt:CustomerGrid>
    <telerik:RadWindow ID="modalPopup" runat="server" Width="360px" Height="360px" Modal="true" OffsetElementID="main">
        <ContentTemplate>
            <div style="padding: 10px; text-align: center;">
                <telerik:RadButton ID="rbToggleModality" Text="Toggle modality" OnClientClicked="togglePopupModality"
                    AutoPostBack="false" runat="server" Height="65px" />
            </div>
            <p style="text-align: center;">
                RadWindow is designed with keyboard support in mind - try tabbing
                    before and after removing the modal background. While the popup is modal
                    you cannot focus the text area, once the modality is removed the text area will
                    be the first thing to receive focus because it has tabIndex=1.
            </p>
        </ContentTemplate>
    </telerik:RadWindow>

</asp:Content>

 

javascript:

var demo = {};

function togglePopupModality() {
    var wnd = getModalWindow();
    wnd.set_modal(!wnd.get_modal());

    if (!wnd.get_modal()) {
        document.documentElement.focus();
    }
}
function showDialogInitially() {
    var wnd = getModalWindow();
    wnd.show();
    Sys.Application.remove_load(showDialogInitially);
}
Sys.Application.add_load(showDialogInitially);

function getModalWindow() { return $find(demo.modalWindowID); }

global.$modalWindowDemo = demo;
global.togglePopupModality = togglePopupModality;

[Aniket]

I am also following this to update web.config but updating web.config won't work.

 http://ajax.asp.net/ajax/documentation/live/ConfiguringASPNETAJAX.aspx#systemwebserver

[Pavlina]

Hello,

Take a look to the following links for more information about this error - Common reasons for the ‘Sys is undefined’ error in ASP.NET Ajax applications: http://www.telerik.com/blogs/common-reasons-for-the-lsquo-sys-is-undefined-rsquo-error-in-asp-net-ajax-applications and General Troubleshooting article: 
http://docs.telerik.com/devtools/aspnet-ajax/general-information/troubleshooting/general-troubleshooting#error-message-microsoft-jscript-runtime-error-sys-is-undefined

Regards,
Pavlina
Telerik