The copyPrototype function doesn't seem to be defined anywhere in your mod.

Error message:
Failed to load mod "recursive-blueprints 0.2.3"
recursive-blueprints/data.lua:3: recursive-blueprints/prototypes/entities.lua:43: attempt to call global 'copyPrototype' (a nil value)

I got same error even when I install though the internal portal in game(13.9). I hope you be able fix it soon.

ps verifying integrity of game cache did not help

I get the same error. I'm using the Steam version, if that helps.

Error doesn't occur in version 2.1

This should be resolved in 0.2.4

nope it's still there -> http://i.imgur.com/ugTlKwl.png?1