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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.
I guess this error is just because of brainfuck's nature and extremly concise explanation attached to the kata.
My advice after struggling with the same error: read attentively conditions both for '[' and ']' chars.