My extensions have stopped working {Solved}

I've built a couple of extensions - not ready for sharing yet as unfinished, but they worked until I downloaded the latest beta.  Has something changed that could have stopped it working?  The extension parsed JSON using https://api.haxe.org/haxe/Json.html

I've tried all the obvious things, but my game will no longer compile with a 'type not found' error for my extensions class name.

Did you try clean project from the tools menu?

Yes, I tried cleaning

Ahh, solved! somehow I'd not capitalised the name of my class file in the same way as in my blocks file - though why it worked under the earlier version of Stencyl I don't know.