Name:Troy Talbot
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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.
If you're not returning anything, that's where the error comes from. (the tests receive None instead of expected list / array)
To be clear, the error comes from calling sorted(None), and not from your code.
Are you returning None?