C3_W2_RecSysNN_Assignment Code error

Course Q&A Machine Learning Specialization Unsupervised Learning, Recommenders, Reinforcement
12

This code cell should be after the code cell starting with

# GRADED_CELL
# UNQ_C1

Was the order of the code cells changed or were some of the code cells deleted?
If this is the case, I suggest saving the code between sections labeled:

### START CODE HERE ###

### END CODE HERE ###

and following these directions, to get your notebook into a correct state.