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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.
Why do you think there is an error? Do you have any helpful pointers, or we just need to guess tests in what language you mean, and what kind of problems?