title: Unknown server tag 'Taxonomy:TaxonomyFieldControl'
body: <p>I'm building a web part in SharePoint 2010, and I need to use the TaxonomyFieldControl for filtering. I have set the reference in the project (the one that isnt 'intl', v14.0.0.0), but I get a warning: "Element 'TaxonomyFieldControl' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing." at compilation, and at runtime I get "Unknown server tag 'Taxonomy:TaxonomyFieldControl'"</p>
  
  <pre><code>&lt;%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %&gt;
  &lt;%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %&gt; 
  &lt;%@ Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %&gt; 
  &lt;%@ Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %&gt;
  &lt;%@ Register TagPrefix="Taxonomy" Namespace="Microsoft.SharePoint.Taxonomy" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %&gt;
  &lt;%@ Register Tagprefix="asp" Namespace="System.Web.UI" Assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %&gt;
  &lt;%@ Import Namespace="Microsoft.SharePoint" %&gt; 
  &lt;%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %&gt;
  &lt;%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebPart_DocumentsUserControl.ascx.cs" Inherits="Test.WebPart_Documents.WebPart_DocumentsUserControl" %&gt;
  ...
  &lt;Taxonomy:TaxonomyFieldControl FieldName="TaxonomyFilter" runat="server"&gt;&lt;/Taxonomy:TaxonomyFieldControl&gt;
  </code></pre>
  
  <p>it is also worth noting that "Taxonomy" does not appear with Intellisense, and neither does "Utilities", but the rest do. Also in the code-behind, i have:</p>
  
  <pre><code>using Microsoft.SharePoint.Taxonomy;
  </code></pre>
  
  <p>and it compiles fine.</p>
  
  <p>I have tried deleting my schema cache per <a href="http://blog.tentaclesoftware.com/archive/2010/07/21/95.aspx" rel="nofollow">http://blog.tentaclesoftware.com/archive/2010/07/21/95.aspx</a></p>
  
  <p>Thank you!</p>