peter@bertha:~/medsphere/GPharmacy/src/GPharmacy$ mdtool build clean
MonoDevelop Build Tool
System.InvalidOperationException: Duplicate property 'GtkDesignInfo' in class 'MonoDevelop.Projects.Project
  at MonoDevelop.Projects.Serialization.ClassDataType.AddProperty (MonoDevelop.Projects.Serialization.ItemProperty prop) [0x00000] 
  at MonoDevelop.Projects.Serialization.DataContext.RegisterProperty (System.Type targetType, System.String name, System.Type propertyType) [0x00000] 
  at MonoDevelop.Projects.ProjectService.OnPropertiesExtensionChanged (ExtensionAction action, System.Object item) [0x00000] 
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_ExtensionAction_object (MonoDevelop.Core.AddIns.ExtensionAction,object)
  at MonoDevelop.Core.AddIns.AddInService.RegisterExtensionItemListener (System.String path, MonoDevelop.Core.AddIns.ExtensionItemListener listener, Boolean notifyCurrentNodes) [0x00000] 
  at MonoDevelop.Core.AddIns.AddInService.RegisterExtensionItemListener (System.String path, MonoDevelop.Core.AddIns.ExtensionItemListener listener) [0x00000] 
  at MonoDevelop.Projects.ProjectService.InitializeService () [0x00000] 
  at MonoDevelop.Core.ServiceManager.FetchService (System.Type serviceType) [0x00000] 
  at MonoDevelop.Core.ServiceManager.GetService (System.Type serviceType) [0x00000] 
  at MonoDevelop.Projects.Services.get_ProjectService () [0x00000] 
  at MonoDevelop.Projects.BuildTool.Run (System.String[] arguments) [0x00000] 
  at MonoDevelop.Core.AddIns.AddInService.StartApplication (System.String addinId, System.String[] parameters) [0x00000]