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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.
The "unknown error" does not help very much. Besides, this problem should give more points than "Finding Neo (PG-13)". I think both give the same points. And another thing is that the test cases are a bit different from the submit. In the test cases, you have that matrix[x,last position] < matrix[x+1, initial position] which this does not happen on submit tests.