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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.
Another possibility is that you return no rows (i.e. an empty result set) when there should be some.
One reason for this error could be that you returned
NULLin a column which expects a value. Make sure your query returns noNULLs and try again.Nonetheless, the error sohuld be fixed, because tests should not crash like that on unexpected values.