title: Visual Studio 2010 UnresolvedAssemblyException: Type universe cannot resolve assembly: log4net
body: <p>Recently, I've started to encounter exceptions in the Visual Studio 2010 WPF designer seemingly due to log4net.  If I freshly build my project, the XAML file will appear correctly in the designer.  Then, once I start to click on controls to jump within the XAML, this exception quickly gets thrown:</p>
  
  <pre><code>System.Reflection.Adds.UnresolvedAssemblyException
  
  Type universe cannot resolve assembly: log4net, Version=1.2.10.0, Culture=neutral,    PublicKeyToken=1b44e1d426115821.
  
  at System.Reflection.Adds.AssemblyProxy.GetResolvedAssembly()
  at System.Reflection.Adds.AssemblyProxy.GetHashCode()
  continues...
  </code></pre>
  
  <p>The problem only goes away when I remove the log4net reference.  This is now the second project to exhibit this behavior.  Has anyone else seen this and/or found a fix?</p>
  
  <p><strong>Note:</strong> I'm using .NET 4 Full (not Client Profile) and I've toggled Specific Version on the log4net reference T/F to no avail.</p>