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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.
But you didn't provide the error. By looking at the code, I think that conversions are problematic. "int" datatype may not be accurate enough.