Creating visualization for tags quantity

Hi guys, i am trying to solve the mission “Popular Data Science questions” and stuck at the moment where i need to make a visualization for how many times each tag was used. I used the following approach:
import matplotlib.pyplot as plt
keys = c.keys()
values = c.values()
plt.plot(keys, values)
but i am facing the error “TypeError: float() argument must be a string or a number, not ‘dict_keys’”
could you please explain what am I doing wrong?
Thanks in advance.