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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 should mention which language has that problem to help us fix it, but I see it's Java, and the reason is, the call to the functions had the arguments in the wrong order. Fixed it.