title: PartialView must derive from WebViewPage error
body: <p>I am getting "must derive from WebViewPage" error when calling PartialView inside other folder instead Views folder.</p>
  
  <p><strong>Error</strong></p>
  
  <pre><code>System.InvalidOperationException: The view at '~/Modules/HtmlContent/_HtmlContent.cshtml' must derive from WebViewPage, or WebViewPage&lt;TModel&gt;.
  PartialView adding
  </code></pre>
  
  <p><strong>Page.cshtml</strong></p>
  
  <pre><code>&lt;div class="side"&gt;
      @Html.Action("Side")
  &lt;/div&gt;
  </code></pre>
  
  <p><strong>HomeController.cs</strong></p>
  
  <pre><code>public ActionResult Side()
  {
      return PartialView("~/Modules/HtmlContent/_HtmlContent.cshtml");
  }
  </code></pre>
  
  <p><strong>File Hierarchy</strong></p>
  
  <pre><code>Modules
  |
  +-- HtmlContent
  |             |
  |             +-- _HtmlContent.cshtml
  |
  Views
      |
      +-- Home
      |      |
      |      +-- Index.cshtml
      |      |
      |      +-- Page.cshtml
      |
      +-- Shared
               |
               +-- Layout.cshtml
               |
               +-- _Partial.cshtml
  </code></pre>