C1_W1_Assignment - Gradient Descent Error

I’m facing the above error at “Gradient Descent” portion. Can anyone guide how to rectify?

Did you complete the code in the gradientDescent() function?

Also, which course are you attending?
You posted in the Machine Learning Specialization Course 1 Week 1, but there is no programming assignment in that week of that course.

Natural Language Processing with Classification and Vector Spaces

Please re-post your message in the correct course.