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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 had the same issue, and it turned out to be the last line of the text. My hint to you: check out for empty lists. Good luck!
as far as I understand, single words in a line do not need space at the end, so this must be the reason. I've read about similar issues here. See instructions: 'Strings with one word do not need gaps'