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Got the same error when using it with sorl-thumbnail. After long time spend on Google, i have came with this simple solution. Actually the error comes from PIL(python-pil). But for Ubuntu users, “pip install PIL” is no longer in service :(. But the coolest thing is we can get rid of this error by simple package python-imaging.
sudo apt-get install python-imaging
hopes that you already installed python-pil and other dependencies mentioned in the sorl-thumbnail tutorial,
for sorl-thumbnail
sudo apt-get install libjpeg62 libjpeg62-dev zlib1g-dev
for python-pil
sudo apt-get install python-pil python-pil-doc python-pil-dbg
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Please check my answer here https://stackoverflow.com/a/41018959/1176671
I do it in my Django project, so hope it would help you with Django as well.
Source:stackexchange.com