parser error in asp.net?
<p>i developed a web application it is working fine in local server. when i uploaded the site in online when i click on some of the buttons i am getting this error. I am using master page, but i am not place the scriptmanager in master page,i place the scriptmanager tag in every page. It is working fine in local server but it is giving error in online.
please can u help me. Thank you</p>

<pre><code>Parser Error
Description: An error occurred during the parsing of a resource required to
service this request. Please review the following specific parse error details
and modify your source file appropriately.

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

Source Error:

Line 9:  &lt;asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"&gt;
Line 10: 
Line 11:     &lt;asp:ScriptManager ID="ScriptManager1" runat="server"&gt;
Line 12:     &lt;/asp:ScriptManager&gt;
Line 13:          &lt;asp:UpdatePanel id="UpdatePanel2" runat="server" UpdateMode="Conditional"&gt;
</code></pre>
