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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.
Generally when unknow errors occur on codewars it's a server problem. Yes, you may import anything you like, but I'd check with the backend guys to see if that's an issue or not.