Issue with C4W1 Sequences, Time Series and Prediction Exercise 6

I am currently working on the Week 1 of the Sequences, Time Series and Prediction module and I’ve run into an issue in Exercise 6.
The Expected Output: is meant to be

“moving average forecast with diff series after slicing has shape: (361,)
comparable with validation series: True”
but I keep getting this
"moving average forecast with diff series after slicing has shape: (0,)

comparable with validation series: False"

I’ve looked through the previous submissions on this topic and still haven’t been able to solve it.
Here is a screenshot

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See if the below post comment helps you debug your codes