Week 2 Programming: Error in model function

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
10

I had copied the parameters of model when I used arguments in optimize in it.
optimize(w,b,X_train,Y_train,num_iterations = 2000, learning_rate = 0.05, print_cost = true)
I changed them to
optimize(w,b,X_train,Y_train,num_iterations, learning_rate , print_cost) and am no longer getting any error.

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