When I click the Submit Button, I'm getting this error:
Script control 'Window' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptControl
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Web.Config
                                Script control 'Window' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptControl
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="admin_Default" %><%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title></title></head><body>    <form id="form1" runat="server">    <telerik:RadStyleSheetManager ID="RadStyleSheetManager1" runat="server">    </telerik:RadStyleSheetManager>    <telerik:RadScriptManager ID="RadScriptManager1" runat="server"/>         <div>    <table>        <tr>            <td>            </td>            <td>                <asp:Label runat="server" ID="admin_header" Text='<%#Eval("s_title")%>' Font-Bold="true"                    Font-Names="verdana" Font-Size="Medium" ForeColor="White" ToolTip='<%#Eval("s_title")%>'></asp:Label>            </td>            <td>            </td>        </tr>        <tr>            <td width="761" align="right">                <asp:FormView ID="fv1" DataSourceID="SqlDataSource1" runat="server" DataKeyNames="cid" DefaultMode="edit">                    <EditItemTemplate>                        <div align="left">                            <asp:Label ID="Label1" runat="server" Text="Page Name:" CssClass="content_text_left_bold"></asp:Label><br />                            <asp:TextBox ID="s_page_name" runat="server" Text='<%#Bind("s_page_name")%>' Width="761" />                            <asp:Label ID="Label2" runat="server" Text="Title:" CssClass="content_text_left_bold"></asp:Label><br />                            <asp:TextBox ID="s_title" runat="server" Text='<%#Bind("s_title")%>' Width="761" />                            <asp:Label ID="Label4" runat="server" Text="Meta Keywords:" CssClass="content_text_left_bold"></asp:Label><br />                            <asp:TextBox ID="s_meta_keywords" runat="server" Text='<%#Bind("s_meta_keywords")%>'                                Width="761" Rows="4" Wrap="true" TextMode="MultiLine" />                            <asp:Label ID="Label5" runat="server" Text="Meta Description:" CssClass="content_text_left_bold"></asp:Label><br />                            <asp:TextBox ID="s_meta_description" runat="server" Text='<%#Bind("s_meta_description")%>'                                Width="761" Rows="4" Wrap="true" TextMode="MultiLine" />                            <div>                                <div>                                    <telerik:RadEditor ID="RadEditor1" runat="server"                                        ImageManager-UploadPaths="/images/content/"                                        ImageManager-DeletePaths="/images/content/"                                        ImageManager-ViewPaths="/images/content/"                                        Content='<%# Bind("page_content") %>'                                        Height="800px" Width="690px"                                         ContentAreaCssFile="~/admin/ContentAreaStyleSheet.css"                                         OnClientLoad="OnClientLoad"                                         ContentFilters="FixEnclosingP">                                        <FontNames>                                            <telerik:EditorFont Value="Arial" />                                            <telerik:EditorFont Value="Baskerville Old Face" />                                            <telerik:EditorFont Value="Bookman old style" />                                            <telerik:EditorFont Value="Calibri" />                                            <telerik:EditorFont Value="Century Gothic" />                                            <telerik:EditorFont Value="Comic Sans MS" />                                            <telerik:EditorFont Value="Constontia" />                                            <telerik:EditorFont Value="Cooper Black" />                                            <telerik:EditorFont Value="Courier New" />                                            <telerik:EditorFont Value="Garamond" />                                            <telerik:EditorFont Value="Georgia" />                                            <telerik:EditorFont Value="Lucida Sans" />                                            <telerik:EditorFont Value="Lucida Sans Unicode" />                                            <telerik:EditorFont Value="MS Sans Serif" />                                            <telerik:EditorFont Value="Segoe UI" />                                            <telerik:EditorFont Value="Tahoma" />                                            <telerik:EditorFont Value="Times New Roman" />                                            <telerik:EditorFont Value="Verdana" />                                        </FontNames>                                    </telerik:RadEditor>                                </div>                                                             <asp:Button ID="Button1" runat="server" Text="Submit Changes" CommandName="update" />                        </div>                    </EditItemTemplate>                </asp:FormView>                <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"                    ProviderName="<%$ ConnectionStrings:ConnectionString.ProviderName %>"                    SelectCommand="SELECT * FROM [content]where cid=@cid"                     UpdateCommand="UPDATE [content] SET [page_content] = @page_content, [s_title] = @s_title, [s_meta_keywords] =@s_meta_keywords, [s_meta_description] =@s_meta_description, [s_page_name] =@s_page_name WHERE cid=@cid"                    CancelSelectOnNullParameter="false">                    <SelectParameters>                        <asp:QueryStringParameter Name="cid" Type="string" QueryStringField="cid" />                    </SelectParameters>                </asp:SqlDataSource>            </td>            <td>            </td>        </tr>        <tr>            <td>            </td>            <td>            </td>            <td>            </td>        </tr>    </table>    </div><script type="text/javascript">    function OnClientLoad(editor) {        var tool = editor.getToolByName("ForeColor");        //Add the button to the color picker                     tool.old_renderFooter = tool.renderFooter;        tool.renderFooter = function () {            this.old_renderFooter();            //Create a button and add it to the tool            var button = document.createElement("button");            button.innerHTML = "Add custom color..";            button.onclick = showColorDialog;            this.get_popupElement().appendChild(button);        }        function showColorDialog() {            var myCallbackFunction = function (sender, color) {                var colors = tool.get_items();                //If no colors are set get the colors from the editor                if (colors.length == 0) {                    colors = editor.get_colors();                }                colors[colors.length] = color;                tool.set_items(colors);                //Set the color to the current selection                editor.get_document().execCommand("ForeColor", false, color);            }            //Hide the color picker            tool.hide();            //Show the Custom Color dialog            editor.showExternalDialog(                      'ForeColorDialog.aspx',                      null,                      600,                      400,                      myCallbackFunction,                      null,                      'ForeColor',                      true,                      Telerik.Web.UI.WindowBehaviors.Close + Telerik.Web.UI.WindowBehaviors.Move,                      false,                      false);        }    };</script>    <telerik:RadAjaxManager runat="server">        <AjaxSettings>            <telerik:AjaxSetting AjaxControlID="RadEditor1">                <UpdatedControls>                    <telerik:AjaxUpdatedControl ControlID="RadEditor1" />                </UpdatedControls>            </telerik:AjaxSetting>        </AjaxSettings>    </telerik:RadAjaxManager>         </form></body></html><configuration>    <connectionStrings>        <add name="ConnectionString" connectionString="Data Source=SQL2008;Initial Catalog=121212;Persist Security Info=True;User ID=121212;Password=121212" providerName="System.Data.SqlClient" />    </connectionStrings>    <location path="Telerik.Web.UI.WebResource.axd">        <system.web>            <authorization>                <allow users="*"/>            </authorization>        </system.web>    </location>    <system.web>        <compilation debug="true" targetFramework="4.0">            <assemblies>                <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />                <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />                <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />                <add assembly="System.Speech, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />            </assemblies>        </compilation>        <customErrors mode="Off" />        <httpHandlers>            <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" />            <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false" />            <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false" />        </httpHandlers>    </system.web>    <system.webServer>        <validation validateIntegratedModeConfiguration="false" />        <handlers>            <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" />            <add name="Telerik_Web_UI_SpellCheckHandler_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" />            <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" />        </handlers>    </system.webServer>    </configuration>
