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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.
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I cannot reproduce the issue, I run sample tests with your solution and they pass as they should. Are you sure that you did not modify the sample tests accidentally? Does the error still persist after you press RESET in the trainer?
In what language?
To know whether your solution is correct or not we would have to see it.