title: Unknown solution item type: {42C0BBD9-55CE-4FC1-8D90-A7348ABAFB23}
body: <p>I am trying to open <a href="https://github.com/OpenDataSpace/CmisSync/blob/gds2-master/CmisSync/Mac/CmisSync.csproj">a project</a> in Monodevelop (3.0.5, with MonoMac add-in enabled) on Mac Mavericks.</p>
  
  <p>I get this error:</p>
  
  <pre><code>MonoDevelop.Projects.Formats.MSBuild.UnknownSolutionItemTypeException: Unknown solution item type: {42C0BBD9-55CE-4FC1-8D90-A7348ABAFB23};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}
    at MonoDevelop.Projects.Formats.MSBuild.MSBuildProjectHandler.CreateSolutionItem (IProgressMonitor monitor, MonoDevelop.Projects.Formats.MSBuild.MSBuildProject p, System.String fileName, System.String language, System.String typeGuids, System.String itemType, System.Type itemClass) [0x00143] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-3.0-series/e159cf08/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Formats.MSBuild/MSBuildProjectHandler.cs:369
  </code></pre>
  
  <p>The most relevant part is probably this one:</p>
  
  <blockquote>
    <p>Unknown solution item type: {42C0BBD9-55CE-4FC1-8D90-A7348ABAFB23};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</p>
  </blockquote>
  
  <p>These UUIDs can be found in the <code>&lt;ProjectTypeGuids&gt;</code> of the <code>.csproj</code> file I try to open.</p>
  
  <ul>
  <li><code>FAE04EC0-301F-11D3-BF4B-00C04F79EFBC</code> is the UUID for C# projects,</li>
  <li><code>42C0BBD9-55CE-4FC1-8D90-A7348ABAFB23</code> is the UUID for MonoMac projects.</li>
  </ul>
  
  <p>I can open other C# projects normally, so I guess this is a problem with Monomac?</p>
  
  <p>Monodevelop has the MonoMac add-in enabled. I tried to compile MonoMac from source but the DLL it generates can't be loaded as an add-in (<code>ZipException</code>).</p>