"Next"button not enabled after completing lesson

I completed my Kelvon Weather tutorial project exactly as required (see code snippet) yet the Next button remains disabled.
// holds the temperature in Kelvin
const kelvin = 283;
//Celsius temperature is Kelvin less 273
const celsius = kelvin - 273;
//Fahrenheit temperature is Celsius *9 /5 +32
let fahrenheit = celsius * (9 / 5) + 32;
fahrenheit = Math.floor(fahrenheit);
console.log(The temperature is ${celsius} degrees Celsius);
console.log(The temperature is ${fahrenheit} degrees Fahrenheit.);
//Convert to Newton
let newton = celsius * (33 / 100);
newton = Math.floor(newton);
console.log(The temperature is ${newton} degrees Newton.);

Did you click the checkmark for the last step? In the projects, you usually have to mark the steps as complete yourself. The system doesn’t do it automatically. Once you mark the last step as complete, the Next button should be enabled.

Thank you, I checked all the checkboxes and the Next button activated.