The issue is that when working the exercise 11 of the C2W1, I unwillingly did something that converted the color of a cell into silver color and from then on I couldn’t edit anything in that cell.
Use the File menu to delete your notebook.
Then use “Lab Help” → “Get latest version” to get a new copy.
(Lab Help is the question-mark inside a circle, in the upper right corner).
Then reload the assignment.
@TMosh’s solution should fix your problem. Otherwise you can fix it yourself by changing the type of the cell from Markdown or Raw to Code as shown below:
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SNaveen: It worked! Very easy to do it. Many thanks to both of you for the quick answer.
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