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Create new MT project from a template.
Double-click the Info.plist
System.NullReferenceException: Object reference not set to an instance of an object
at MonoMac.Foundation.NSArray.ArrayFromHandle[NSObject] (IntPtr handle) [0x0004d] in /Users/michael/Mono/maccore/src/Foundation/NSArray.cs:150
at MonoDevelop.MacDev.PlistEditor.PDictionary.Conv (MonoMac.Foundation.NSObject val) [0x00082] in /mono/ios/monodevelop/monodevelop/main/src/addins/MonoDevelop.MacDev/MonoDevelop.MacDev.PlistEditor/PListObject.cs:400
at MonoDevelop.MacDev.PlistEditor.PDictionary.Reload (System.String fileName) [0x0004b] in /mono/ios/monodevelop/monodevelop/main/src/addins/MonoDevelop.MacDev/MonoDevelop.MacDev.PlistEditor/PListObject.cs:375
at MonoDevelop.MacDev.PlistEditor.PListEditorViewContent.Load (System.String fileName) [0x00007] in /mono/ios/monodevelop/monodevelop/main/src/addins/MonoDevelop.MacDev/MonoDevelop.MacDev.PlistEditor/PListEditorViewContent.cs:57
at MonoDevelop.Ide.Gui.LoadFileWrapper.Invoke (System.String fileName) [0x00102] in /mono/ios/monodevelop/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui/Workbench.cs:1044
Can't reproduce it - are you using a master version of mono ?
I've added some checks so that won't happen anymore, but it's a bug that's somewhere different.
If that happens again I could need the project. (y even if it's created by a template)
I use master MonoDevelop, and your fix fixed it.