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System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object
at MonoDevelop.MacDev.PlistEditor.DocumentTypeListWidget.OnCreateNew (System.EventArgs e) [0x0002f] in /Users/builder/data/lanes/monodevelop-lion-master/9b07a665/source/md-addins/MonoDevelop.MacDev/MonoDevelop.MacDev/PlistEditor/DocumentTypeListWidget.cs:145
at MonoDevelop.MacDev.PlistEditor.ExpanderList.<Clear>m__43 (System.Object , System.EventArgs ) [0x00000] in /Users/builder/data/lanes/monodevelop-lion-master/9b07a665/source/md-addins/MonoDevelop.MacDev/MonoDevelop.MacDev/PlistEditor/ExpanderList.cs:73
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x000d5] in /Users/builder/data/lanes/mono-mac-ui-refresh-2-10/2baeee2f/source/bockbuild/profiles/mono-2-10/build-root/mono-2.10.11/_build/mono-2.10.11.git/mcs/class/corlib/System.Reflection/MonoMethod.cs:226
--- End of inner exception stack trace ---
at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x000eb] in /Users/builder/data/lanes/mono-mac-ui-refresh-2-10/2baeee2f/source/bockbuild/profiles/mono-2-10/build-root/mono-2.10.11/_build/mono-2.10.11.git/mcs/class/corlib/System.Reflection/MonoMethod.cs:234
at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/mono-mac-ui-refresh-2-10/2baeee2f/source/bockbuild/profiles/mono-2-10/build-root/mono-2.10.11/_build/mono-2.10.11.git/mcs/class/corlib/System.Reflection/MethodBase.cs:96
at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x000bf] in /Users/builder/data/lanes/mono-mac-ui-refresh-2-10/2baeee2f/source/bockbuild/profiles/mono-2-10/build-root/mono-2.10.11/_build/mono-2.10.11.git/mcs/class/corlib/System/Delegate.cs:413
at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00018] in /Users/builder/data/lanes/mono-mac-ui-refresh-2-10/2baeee2f/source/bockbuild/profiles/mono-2-10/build-root/mono-2.10.11/_build/mono-2.10.11.git/mcs/class/corlib/System/MulticastDelegate.cs:70
at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in /Users/builder/data/lanes/mono-mac-ui-refresh-2-10/2baeee2f/source/bockbuild/profiles/mono-2-10/build-root/mono-2.10.11/_build/mono-2.10.11.git/mcs/class/corlib/System/Delegate.cs:387
at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0
at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0
at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000] in <filename unknown>:0
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