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Peter ChanFlag for Hong Kong

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Problem to ToolkitScriptManager

Hi,
How to resove this?

Parser Error 
  Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

 Parser Error Message: Unknown server tag 'cc1:ToolkitScriptManager'.

Source Error: 



Line 49:     </div>
Line 50:     <div class="right up">
Line 51:     <cc1:ToolkitScriptManager runat="server"></cc1:ToolkitScriptManager>
Line 52: 	<asp:panel id="Panel_Msg" style="display:none;" runat="server">
Line 53: 		<asp:Literal id="L_Msg" runat="server"/>
  

 Source File:  /Login4/Default.aspx    Line:  51 

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Ryan Chong
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Yes, I have such codes below,
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Login._Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
...

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