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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.
Try making sure this case works, near the bottom of the description:
"The path ["NORTH", "WEST", "SOUTH", "EAST"] is not reducible."
The input and output should be the same for that example.
Read this: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#print-input
These are not errors in testing, you misunderstood the task. Read through description once again, then read the posts below which mention very similar problems like the one you have.
Your solution simplifies steps it's not allowed to.