Help please! with '.upcase' y '.downcase' in spanish

[codekarina]

puts “karina”.upcase
puts “KARINA”.downcase

Unknown Error: KARINA
karina
RESULT nil

¡Uy! Probá otra vez. Parece que no se muestra nada en la ventana de Resultados.

I can not move forward because this error appears.

Thanks.

[mtf]

Please link to the exercise in question. Thanks.

[system]

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