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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 saw a similar error using PHP when I output huge amount of print_r() or var_dump() messages (quick debugging for me).
Propably because passed tests print this messages anyway (send them to browser)
I saw a similar error using Javascript. I had an error in my code that had nothing to do with JSON. I fixed the error and everything worked.
What language are you using? And please verify your code as JSON wasn't used at all in the TestCases and Solution. Did you by any means use JSON in your solution?