Cake 3 RC1 aura intl problem

Can't figure why I'm having this problem: 

Aura\Intl\Exception: Package 'cake' with locale 'en_US' is not registered. in /vendor/aura/intl/src/Aura/Intl/PackageLocator.php on line 96

I'm having that problem with debug_kit as well. I've just literally created a project from scratch with composer. I also couldn't get plugin routes working but that's a different story.

Any clue what this could be? I've looked at everything and couldn't figure it out.

Thanks

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