title: VS2010 Code: 2104 Could not download the Silverlight application
body: <p>I've just started getting this Javascript error running VS2010 with SL4</p>
  
  <pre><code>Error: Unhandled Error in Silverlight Application 
  Code: 2104    
  Category: InitializeError       
  Message: Could not download the Silverlight application. Check web server settings     
  </code></pre>
  
  <p>Everything was working fine, changed 1 line of code to use a RegularExpression in the web project (using the Silverlight Business Application template) then when rebuilding I get this error.</p>
  
  <p>Google says this is IIS and mimetype related. I'm using Cassini not IIS with VS2010.</p>
  
  <p>Rebooted, cleared xap from IE cache. Error on both IE and FF.</p>
  
  <p>What could be wrong?</p>