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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 had the same problem. Did you include a return statement? For me, it stemmed from not understanding how the testing is done. I had included a print statement to print the results. When I changed it to a RETURN statement, the error went away. The instructions say to write a program, but really, you're only writing a function and stopping there. Adding more will make the testing setup error out.
same as you