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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.
Amount of information in this bug report makes it impossible to even start fixing the issue. Closing as per insufficient details.
That's because
flat
is available since Node 11, but this kata is available only in Node 8.flat
will work when this kata will be updated to the newer version of Node.