title: Can't build any MonoMac samples on MonoDevelop 3.0 in OS X
body: <p>I just did a clean install of MonoDevelop 3.0 in OS X (10.7.2) and then did a Git checkout of <a href="https://github.com/mono/monomac" rel="nofollow" title="MonoMac">MonoMac</a>.  I can't build any of the samples included in the MonoMac repository, and I get the same error every time after the output says the build succeeded:</p>
  
  <pre><code>Build failed. Object reference not set to an instance of an object
  </code></pre>
  
  <p>Full sample build output:</p>
  
  <pre><code>Cleaning Solution: Fire (Debug)
  
  Cleaning: Fire (Debug)
  Removing output files...
  Clean complete
  
  Building Solution: Fire (Debug)
  
  Building: Fire (Debug)
  Performing main compilation...
  /Library/Frameworks/Mono.framework/Versions/2.10.9/bin/dmcs /noconfig "/out:/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.exe" "/r:/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/System.dll" "/r:/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/System.Xml.dll" "/r:/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/System.Core.dll" "/r:/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/System.Xml.Linq.dll" "/r:/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/System.Drawing.dll" "/r:/Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoMac/MonoMac.dll" /nologo /warn:4 /debug:full /optimize- /codepage:utf8 "/define:DEBUG"  /t:exe "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainWindow.cs" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainWindowController.cs" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainWindow.xib.designer.cs" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/Main.cs" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/AppDelegate.cs" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainMenu.xib.designer.cs" 
  
  Compiling interface definitions
  /Developer/usr/bin/ibtool --errors --warnings --notices --output-format human-readable-text --compile "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/Resources/MainWindow.nib" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainWindow.xib"
  /* com.apple.ibtool.document.warnings */
  /Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainWindow.xib:2: warning: Content rectangle not entirely on screen with the menu bar (May not be completely visible for all screen resolutions and configurations) [9]
  /Developer/usr/bin/ibtool --errors --warnings --notices --output-format human-readable-text --compile "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/Resources/MainMenu.nib" "/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/MainMenu.xib"
  
  Copying content files
  Copying '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.exe' to '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/MonoBundle/Fire.exe'
  Copying '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.exe.mdb' to '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/MonoBundle/Fire.exe.mdb'
  Copying '/Applications/MonoDevelop.app/Contents/MacOS/lib/monodevelop/AddIns/MonoDevelop.MonoMac/MonoMac.dll' to '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/MonoBundle/MonoMac.dll'
  Copying '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/fire.png' to '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/Resources/fire.png'
  Copying '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/smoke.png' to '/Users/dave/Dropbox/Code/MonoMac/monomac/samples/Fire/bin/Debug/Fire.app/Contents/Resources/smoke.png'
  Build complete -- 0 errors, 0 warnings
  
  Updating application manifest
  
  ---------------------- Done ----------------------
  
  Build successful.
  Build failed. Object reference not set to an instance of an object
  </code></pre>
  
  <p>What am I doing wrong here?</p>