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    You are misreading the sample tests. Look how tribonacci(sig, len) is called in the sample tests. User solution is called with two arguments, not one.

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    That's because you messed up the function signature. The corrrect one, present initially in the solution setup, is function tribonacci(signature,n). You changed it in a way which turns the signature argument into not a sequence.

    It's not a kata issue, you need to fix your solution. Also make sure you run testss with version of Node which supports at.