Content controls are allowed only in content page that references a master page.

Hi

I'm getting the above error with my application.

Basically I had a master file and then some page files referencing the master file.

In the page files I had some ajax controls so had :

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<atlas:ScriptManager ID="ScriptManager1" runat="server">
</atlas:ScriptManager>

in them.

but when I try adding an ajax control to the master file and putting the above code in, it shows the error message

why would this be?

thanks!