gistfile1.txt

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.Core.StringParserService.Parse (System.String input, IStringTagModel customTags) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Core.StringParserService.Parse (System.String input) [0x00007] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.11-branch/30c6f217/source/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core/StringParserService.cs:82 
  at MonoDevelop.Ide.ExternalTools.ExternalToolPanelWidget.FilterPath (System.String path) [0x00002] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.11-branch/30c6f217/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.ExternalTools/ExternalToolPanel.cs:300 
  at MonoDevelop.Ide.ExternalTools.ExternalToolPanelWidget.Validate () [0x00029] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.11-branch/30c6f217/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.ExternalTools/ExternalToolPanel.cs:310 
  at MonoDevelop.Ide.ExternalTools.ExternalToolPane.ValidateChanges () [0x00007] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.11-branch/30c6f217/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.ExternalTools/ExternalToolPanel.cs:54 
  at MonoDevelop.Ide.Gui.Dialogs.OptionsDialog.ValidateChanges () [0x00052] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.11-branch/30c6f217/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Dialogs/OptionsDialog.cs:408 
  at MonoDevelop.Ide.Gui.Dialogs.OptionsDialog.OnButtonOkClicked (System.Object sender, System.EventArgs e) [0x00002] in /Users/builder/data/lanes/monodevelop-lion-monodevelop-4.1.11-branch/30c6f217/source/monodevelop/main/src/core/MonoDevelop.Ide/MonoDevelop.Ide.Gui.Dialogs/OptionsDialog.cs:692 
  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) [0x00054] in /private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin/build-root/mono-3.2.3/mcs/class/corlib/System.Reflection/MonoMethod.cs:230 
  --- 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) [0x00069] in /private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin/build-root/mono-3.2.3/mcs/class/corlib/System.Reflection/MonoMethod.cs:238 
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin/build-root/mono-3.2.3/mcs/class/corlib/System.Reflection/MethodBase.cs:114 
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x000d5] in /private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin/build-root/mono-3.2.3/mcs/class/corlib/System/Delegate.cs:424 
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00018] in /private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin/build-root/mono-3.2.3/mcs/class/corlib/System/MulticastDelegate.cs:72 
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in /private/tmp/source/bockbuild-xamarin/profiles/mono-mac-xamarin/build-root/mono-3.2.3/mcs/class/corlib/System/Delegate.cs:398 
  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