[Mono-osx] Create a Mac Installer: TypeLoadException ProcessArgumentBuilder

[Joel Bierling]

Created a brand new MonoMac (2.4.0.13) project with MonoDevelop 2.4.2
and tried to Create a Mac Installer.  I'm getting this:

Error - 3:52:49 PM - Unhandled exception in packaging
System.TypeLoadException: Could not load type
'MonoDevelop.MacDev.ProcessArgumentBuilder' from assembly
'MonoDevelop.MacDev, Version=2.4.0.0, Culture=neutral,
PublicKeyToken=null'.
  at MonoDevelop.MonoMac.Gui.MonoMacPackaging+<Package>c__AnonStorey2.<>m__2
() [0x00000] in <filename unknown>:0

Ideas?

Thanks,
-Joel