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copied!<p><strong>UPDATE</strong> The reason this is happening is that when an image is specified in a css file, and that image is missing the routing framework tries to map the url to a controller. Ignoring the routes as listed below will prevent the error from happening, but I decided not to implement it because it's a nice way of being notified that you have a missing resource.</p> <p>You can see a detailed explanation along with examples of setting up dependency injection using Structure Map <a href="http://www.codingcontext.com/post/ControllerType-Is-Null-When-Creating-A-Custom-ControllerFactory.aspx" rel="noreferrer">here</a>.</p> <p>I was having the same issue and I think I figured it out. For whatever reason whenever you try to provide your own Controller Factory you need to add a couple of additional IgnoreRoute definitions. The first thing I would do is add this line to your GetControllerInstance method:</p> <pre><code>if(controllerType == null) return base.GetControllerInstance(controllerType) </code></pre> <p>This will at least give you more information in the error message as to what the request is that is causing the controllerType to be null. In my particular case I had a background image in my css file set like this:</p> <pre><code>background: url(img/logo.gif); </code></pre> <p>So what happens is the routing is looking for a controller called "img" and an action that takes logo.gif or something along those lines. That's obviously not the correct behavior. </p> <p>After some digging I realized I needed to add an IgnoreRoute definition to my Global.asax file that would ignore anything in the "content" directory of my site like this:</p> <pre><code>routes.IgnoreRoute("{Content}/{*pathInfo}"); </code></pre> <p>I'm still not sure why you don't need to do this with the default ControllerFactory, but nonetheless it works.</p> <p>You'll probably run into the same issue with favicon.ico. Particularly if you using google crhome. You'll need to add this as well:</p> <pre><code>routes.IgnoreRoute("{*favicon}", new {favicon=@"(.*/)?favicon.ico(/.*)?"}) </code></pre>

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