What am I doing wrong in my code?

This is the Code Challenge Task 2: OK, now let's handle the racecar running laps. Add a laps attribute to the RaceCar class and set it to 0. Add a method named run_lap. It'll take a length argument. It should reduce the fuel_remaining attribute by the length argument multiplied by 0.125 (length * 0.125). Also, increment the laps attribute by 1 each time the run_lap method is called.

I got task 1 right, which involves creating the class and typing the whole __init__ part upto the setattr() bit

I have tried running this code in the REPL and it works fine, but when I check my work in the challenge, it says "Bummer: Try again" repeatedly. I'm not sure what I'm doing wrong.

Any help is appreciated!

class RaceCar:
    def __init__ (self, color, fuel_remaining, **kwargs):
        self.color = color
        self.fuel_remaining = fuel_remaining

        for key, value in kwargs.items():
            setattr(self, key, value)

    laps = 0

    def run_laps(self, length):
        self.fuel_remaining -= (length * .125)
        self.laps += 1