Evolution plugin causes Do to crash

In bzr 435.

The evolution plugin has made Do crash in bzr 419 and on, this is the latest twist.

** (Do:19471): WARNING **: Could not load file or assembly 'evolution-sharp, Version=3.0.0.0, Culture=neutral, PublicKeyToken=457eed85bd9370df' or one of its dependencies.
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.TypeLoadException: A type load exception has occurred.
  at GLib.Signal.voidObjectCallback (IntPtr handle, IntPtr data) [0x00000]
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at GLib.Signal.voidObjectCallback(IntPtr handle, IntPtr data)
   at GLib.Signal.voidObjectCallback(IntPtr , IntPtr )
   at Gtk.Application.gtk_main()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Do.Do.Main(System.String[] args)

Upon actually reading the error it sounds like the plugin requires Evolution Sharp, but Do itself does not. Perhaps instead of crashing out Do could simply prompt the user to install the dep?