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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.
The error is telling you exactly what's wrong. You can't call
list()
on a number, because that's what the input is: a number.Chances are when you "test it yourself", you're testing it with something like
"1234"
, which is astring
, not a number.