Не работает Ajax в Mono

 
Server Error in '/' Application
Compilation Error
Description: Error compiling a resource required to service this request. Review your source file and modify it to fix this error.
Compiler Error Message: CS0029: Cannot implicitly convert type `System.Web.UI.UpdatePanel' to `System.Web.UI.UpdatePanel'
Source Error:
Line 47:                                             </td>
Line 48:                                             <td class="style2">
Line 49:                                                 <asp:UpdatePanel ID="UpdatePanel1" runat="server">
Line 50:                                                     <ContentTemplate>
Line 51:                                                         <asp:ComboBox ID="ComboBox1" runat="server" DataTextField="Category" DataValueField="Category"
Source File: /var/www/msweb/PositionFinder.ascx  Lines: 49, 91, 109, 124, 138, 152