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Problem to ToolkitScriptManager

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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1 Solution
Ryan ChongCommented:
are you missing to import some libraries into your project?

OR are you missing to register your custom control in your aspx page?

did you add something like this in your aspx page?

<%@ Register src="YourCustomControl.ascx" tagname="ToolkitScriptManager" tagprefix="cc1" %>

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HuaMinChenBusiness AnalystAuthor Commented:
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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to the Web page.
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