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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I can also confirm that using the default Node v6.6.0 throws the errors listed above and that switching to Node v0.10.33/Babel remedies the problem.