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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.
Because you try to apply a string method (title) to a number (0). Use an empty string, not 0.
Use local IDE, debug, step through your code.
Read the error message, you forgot the
:and please mark your post as having spoiler content next time.