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    Sorry for late response...
    The signature is func bmi(_ weight: Int, _ height: Double) -> String, so func calcBMI(userWeight weight: Double, userHeight height: Double) -> String won't work.

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    AFAIK, it works in Swift, check the function's name, in the kata it's bmi and the parameter's types are Int and Double, click reset to see it.

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    Post your code and we can help.
    (Note: with a spoiler flag, and using markdown formatting.)