No Module Named Pil In Heroku Though It Is Installed

I have been trying to deploy a Django application on Heroku. Some background - I hadn't used virtual environment while building the application but while deploying it, I had to use

Solution 1:

If you are doing this in your view

import PIL

do this

import Image

Solution 2:

Heroku? Access your application and manually run pip install -r requirements.txt, then turn the application off and back on again.

I had this problem before, this step solved my problem.

Solution 3:

In my case I solved this issue by installing 'Pillow'... just try pip/pip3 install Pillow and add it to your requirements.txt file.