Only one instance of a ScriptManager can be added to the page

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Ensure you have one and only one <asp:Scriptmanager> on the masterpage.
Ensure you also have one and only one <asp:ScriptManagerProxy> on each and every content page that might require a script manager

http://stackoverflow.com/questions/1996095/only-one-instance-of-a-scriptmanager-can-be-added-to-the-page

http://dotnetfish.blogspot.com/2007/12/only-one-instance-of-scriptmanager-can.html

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