Engine Extension Compile Error

This one is baffling me.
(see attached image)

Started showing up when I went into a project that uses the Dialog extension. I updated the extensions and it didn't fix it. I'm on Stencyl 9279 with a clean install. I updated my Haxe and OpenFL as well.

Any thoughts?

I'm going to roll back a version of  stencyl until this gets sorted.