I'm trying to get courier to work.when i try to call "transfer to staging" i get the following error:

Parser Error Message: The base class includes the field 'smProxy', but its type (System.Web.UI.ScriptManagerProxy) is not compatible with the type of control (System.Web.UI.ScriptManagerProxy).

Source Error:

Line 57: </asp:Content>

Line 58: <asp:Content ID="Content1" ContentPlaceHolderID="body" runat="server">

Line 59:     <asp:ScriptManagerProxy runat="server" id="smProxy">

Line 60:     <Services><asp:ServiceReference Path="../webservices/messenger.asmx" /></Services>

Line 61:     </asp:ScriptManagerProxy>

dev and staging are both running umbraco 4.1. Server is running on win server 2003 x64.

Any ideas?