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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.
That's because of this other line in your code:
Remove it or call the function with the right name:
count_sheeps
.It says line 11 and it shows the line's content in the error message.