AJAX in ASP.Net ScriptManager error

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Hey,
I have a master.page and a Default.aspx page. I'm trying to use AJAX
to postback to the server. However, when I place the
<asp:ScriptManager ...> tag on the Default.aspx page I get an "Element
'ScriptManager' is not a known element. This can occur if there is a
compilation error on the Web site." on the mouse-over.

What is the prblem here? Am I missing something?

Thanks
Steve

.

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