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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.
For me, it was because I was checking for empty code before the flush. Flush should be executed 'before execution', so it has to be the first thing that happens.