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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.
If you read the stack trace carefully it'll tell you that you called
ToList()
on anull
.You can
Console.WriteLine()
the inputs to see what they are.