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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.
You do something bad, necessarily. I've just used it successfully, as does the third topvoted solution. So please check your code. Look for online documentation if you don't find, you only need to import stuff properly, it's straightforward.
It does work, you must do something bad (you need to import it). Please say which language you use (I guess it's Python).