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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 read the error, it says that you tried to iterate over something that is
None. There's no way we can help without seeing your code. Make sure to read THIS first.