Why doesn't Python Kivy code run?

Question

Python

The Python Kivy code throws an error on the command line. Please tell me what to do:

from kivy.app import App
from kivy.uix.button import Button

class MyApp(App):
    def build(self):
        return Button()

if __name__ == '__main__':
  MyApp().run()

Answer 1

No module named 'PIL'
Is PIL installed?