Issue as a name error in all exercises in Week 2 Logistic_Regression_with_a_Neural_Network

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
1

I have coded but facing issue as a name error mostly for all exercises. Is I am missing with any library. Below is the error message:

NameError Traceback (most recent call last)
in
5 # YOUR CODE STARTS HERE
6
----> 7 m_train = train_set_x_orig.shape[0]
8 m_test = test_set_x_orig.shape[0]
9 num_px = train_set_x_orig.shape[1]

NameError: name ‘train_set_x_orig’ is not defined

2

Please run the cell that loads the dataset before running the cell in your post.
The interpreter error says that train_set_x_orig is not defined.

If you’re unable to find the cell, refresh your workspace and try again.
See Refresh your Lab Workspace section here