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If you have a MonoTouch library project open in your solution, and it is the currently selected project, clicking on the "Project" menu at the top of the screen will crash MonoDevelop with the error / exception below. This does not happen in the MT application project is currently selected in solution explorer.
Steps to reproduce:
1) Open MonoDevelop
2) Open TweetStation
3) MonoTouch.Dialog in the Solution Explorer
4) Click on the "Project" menu at the top of the screen
5) Observe crash:
Error while updating status of command:
System.NullReferenceException: Object reference not set to an instance of an object
at MonoDevelop.IPhone.PlistEditor.IPhoneManifestExtensions.GetMinimumOSVersion (MonoDevelop.MacDev.PlistEditor.PDictionary dict) [0x00000] in /private/tmp/source/md-addins/MonoDevelop.IPhone/MonoDevelop.IPhone/PlistEditor/IPhoneManifestExtensions.cs:130
at MonoDevelop.IPhone.SelectSimulatorTargetHandler.Update (MonoDevelop.Components.Commands.CommandArrayInfo info) [0x00072] in /private/tmp/source/md-addins/MonoDevelop.IPhone/MonoDevelop.IPhone/IPhoneCommands.cs:74
at MonoDevelop.Components.Commands.CommandHandler.InternalUpdate (MonoDevelop.Components.Commands.CommandArrayInfo info) [0x00000] in /private/tmp/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CommandHandler.cs:52
at MonoDevelop.Components.Commands.CommandManager.DefaultUpdateCommandInfo (MonoDevelop.Components.Commands.ActionCommand cmd, MonoDevelop.Components.Commands.CommandInfo info) [0x00057] in /private/tmp/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CommandManager.cs:777
at MonoDevelop.Components.Commands.CommandManager.GetCommandInfo (System.Object commandId, MonoDevelop.Components.Commands.CommandTargetRoute targetRoute) [0x001a9] in /private/tmp/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Components.Commands/CommandManager.cs:747
This was fixed with commit 7a785781 a couple of days ago. It was probably fallout from when we stopped incorrectly generating Info.plist files for libraries.