title: Unknown server tag 'webopt:BundleReference'
body: <p>I have developed a web form in ASP.Net 4.5 using Visual Studio 2012 for Web Express. It is hosted on somee.com. When the page loads I get the following error:</p>
  
  <pre><code>Server Error in '/' Application.
  
  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 'webopt:BundleReference'.
  
  Source Error: 
  
  
  Line 9: &lt;%: Scripts.Render("~/bundles/modernizr") %&gt;
  Line 10: &lt;/asp:PlaceHolder&gt; 
  Line 11: &lt;webopt:BundleReference runat="server" Path="~/Content/css" /&gt; 
  Line 12: &lt;link href="~/favicon.ico" rel="shortcut icon" type="image/x-icon" /&gt;
  Line 13: &lt;meta name="viewport" content="width=device-width" /&gt;
  
  Source File: /Site.Master Line: 11 
  
  Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET  Version:4.0.30319.17929
  </code></pre>