Getting error while using Ajaxtoolkit -CalendarExtender

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ASP.NET

Hi,
I have used
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

and


<asp:TableCell ID="TableCell78" runat="server">
<asp:TextBox cssclass="textbox" ID="Txtbd1" runat="server"><cc1:CalendarExtender ID="CalendarExtender1" runat="server" TargetControlID="Txtbd1" Format="dd/MM/yyyy">


This works fine in my Local system.but when i put this on Hosting server I am getting the error

Operation could destabilize the runtime.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Security.VerificationException: Operation could destabilize the runtime.