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I think I had MonoDevelop in the background when I did this sequence:
1) Close xcode
2) Delete the directory of the solution I had open
3) Unzipped a fresh one
4) Clicked on MonoDevelop so it'd regain focus
System.NullReferenceException: A null value was found where an object instance was required.
at MonoDevelop.MacDev.XcodeSyncing.XcodeProjectTracker.SyncXcodeChanges (IProgressMonitor monitor) [0x00017] in /Users/alanmcgovern/Projects/monodevelop/main/src/addins/MonoDevelop.MacDev/XcodeSyncing/XcodeProjectTracker.cs:351
Can't reproduce this and the stacktrace is useless, so I'll just close it.