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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 cannot help, because I cannot reproduce your error. Can you please attach your code?
No worries. This section is used if you're stuck and can't solve it, or kata has bugs that need to be reported, etc.
Please don't post your solutions here, that's what 'Solutions' tab is for.