Unknown server tag 'asp:ScriptManager'

I have my app all ready to go, but I can't get it working on the server.  It's running .NET 4.0, which I thought included AJAX extensions.  Anybody have any ideas?

This is the error I get.


Parser Error Message: Unknown server tag 'asp:ScriptManager'.

Source Error:

Line 28: <body>
Line 29:     <form id="form1" runat="server">
Line 30:     <asp:ScriptManager ID="MainScriptManager" runat="server" EnableHistory="True" />
dtburdickAsked:
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BuggyCoderCommented:
make sure you have this section in web.config:-
<pages>
      <controls>
               <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
      </controls>
  </pages>

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see these as well:-
http://forums.asp.net/t/1707661.aspx/1
http://forums.asp.net/p/1054146/1495802.aspx

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dtburdickAuthor Commented:
I added it, but still get the same error.
dtburdickAuthor Commented:
I also checked the other links to no avail.
BuggyCoderCommented:
please make sure that you have control library installed on server and that too of the correct version, the version of library installed on server has to be same as on your machine.

the same version is to be specified in web.config tags....
dtburdickAuthor Commented:
I was looking at the old server while making changes to the new one.  It is working now.  Thank you.
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