Course 4 week 1 assignment

i’m not getting an error code yet but im sure im heading for an issue - i don’t know why if all my cell blocks are in line with expected output until the second metric for mse and mae -the expected outputs are 19.58 and 2.6 for naive_forecast but i’m suddenly coming out with 0.0 and 0.0 -this cant be so its me obviously - i should probably scrap and start over - its a prior block perhaps the way i’m writing some of the code even though its output is correct?

The expected outputs are correct. Please check your work.
If you’re lost, click my name and message your notebook as an attachment.