Can't open Monodevelop

All of a sudden when I double click a script file monodevelop throws this error. I tried uninstalling Unity with the latest version and still can't get it to work. I see the following:

MonoDevelop-Unity failed to start. The following error has been reported: Invalid action command id: MonoDevelop-Unity.Debugger.DebugCommands.AttachToProcess

System.InvalidOperationException: Invalid action command id: MonoDevelop.Debugger.DebugCommands.AttachToProcess
at MonoDevelop.Components.Commands.CommandManager.GetCommandInfo(Object commandId, CommandTargetRoute targetRoute)
at MonoDevelop.Components.Commands.CommandManager.GetCommandInfo(Object commandId)
at MonoDevelop.Components.MainToolbar.MainToolbar.GetStartButtonCommandInfo(OperationIcon& operation)
at MonoDevelop.Components.MainToolbar.MainToolbar.MonoDevelop.Components.Commands.ICommandBar.Update(Object activeTarget)
at MonoDevelop.Components.Commands.CommandManager.RegisterCommandBar(ICommandBar commandBar)
at MonoDevelop.Components.MainToolbar.MainToolbar..ctor()
at MonoDevelop.Ide.Desktop.PlatformService.CreateMainToolbar(Window window)
at MonoDevelop.Ide.DesktopService.CreateMainToolbar(Window window)
at MonoDevelop.Ide.Gui.DefaultWorkbench.CreateComponents()
at MonoDevelop.Ide.Gui.DefaultWorkbench.InitializeLayout()
at MonoDevelop.Ide.Gui.Workbench.Initialize(IProgressMonitor monitor)
at MonoDevelop.Ide.IdeApp.Initialize(IProgressMonitor monitor)
at MonoDevelop.Ide.IdeStartup.Run(MonoDevelopOptions options)