Good morning, how are you?
I’m having trouble with the analyzing-car-co2 exercise. The error I’m getting is: The object required for grading cannot be found in your code.
I don’t want to violate the code of ethics, but the order of my columns is: Es, Cty, Hiy, Comb, Comb(), CO2
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Can someone help me? please 
Hi Federico!
I just answered you in another thread, but here it goes again:
Issues with `object required for grading not found` are almost always fixed when you reset your notebook. You can follow the instructions here in order to do so. Good luck 