Problem in programming assignment

I am doing programming assignment of 2nd week of first course of machine learning specialization but code given by them are not working so i am not able to understand what to do

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@Abraham2, did you figure this out?

As with the labs in the first week, you need to run each code cell in order. Starting with the second week, the programming assignments also have portions marked with:

### START CODE HERE ###

### END CODE HERE ### 

that you need to fill in by writing the code yourself. There are explanations above the code cell that explain what your code should do, and also green “Click for hints” links after the cell that you can click on for more hints about what you should fill in.