title: I am getting an error using pandas and matplot during plotting a graph
body: <p>when I was trying to plot the graph using that code I get an error
  What should I do?</p>
  <p>link of jupyter notebook
  <a href="https://colab.research.google.com/drive/1ZwyB_G_yoFfuYD0fuh3xYpkqcXH0OdTC?authuser=1#scrollTo=UEJpa9m1S-GJ" rel="nofollow noreferrer">click me to get code</a></p>
  <p>please check and do some correction</p>