python/django - "Cannot use ImageField because Pillow is not installed"

Question

I'm joining a project, so I want to set up the environnment, so what I did is :

pip install -r requirements.txt 

This fully installed all requirements including django 1.7.0, Pillow 2.4.0 and some others.

Then I want to build the database :

python manage.py migrate 

And boom, error, I get the following :

CommandError: System check identified some issues:  ERRORS: stu.chan.icon: (fields.E210) Cannot use ImageField because Pillow is not installed.     HINT: Get Pillow at https://pypi.python.org/pypi/Pillow or run command "pip install pillow". stu.chan.image: (fields.E210) Cannot use ImageField because Pillow is not installed.     HINT: Get Pillow at https://pypi.python.org/pypi/Pillow or run command "pip install pillow". stu.Piec.icon: (fields.E210) Cannot use ImageField because Pillow is not installed.     HINT: Get Pillow at https://pypi.python.org/pypi/Pillow or run command "pip install pillow". 

... like I didn't install Pillow. So I checked the installed package (with this technique), and Pillow 2.4.0 IS installed.

Then, I also tried to force reinstall : pip install --upgrade --force-reinstall Pillow==2.4.0

But, nothing to do I get the same error when running migrate.

I'm using python 3.4.0 and django 1.7.0 on a mac OS X 10.6.7 wrapped in virtualenv 1.11.6 with pip downgraded to pip 1.2.1 (because of some well-known-yet-not-fully-resolved-nor-understood issue with pip and ssl).

All of the code above is within virtualenv (bin/activate done).

Do you have any ideas on why this problem and how to resolve it?

- - - - - - EDIT - - - - - -

When I run the above force-reinstall command, (so many code gets outpouted I can't paste it all but) although it finishes with "Successfully installed Pillow", there's some warnings in the code :

building 'PIL._imaging' extension  (blabla code)     _imaging.c:975:13: warning: array index of '1' indexes past the end of an array (that contains 1 elements) [-Warray-bounds]         value = PyTuple_GET_ITEM(xy, 1);                 ^~~~~~~~~~~~~~~~~~~~~~~     /usr/local/include/python3.4m/tupleobject.h:58:34: note: instantiated from:     #define PyTuple_GET_ITEM(op, i) (((PyTupleObject *)(op))->ob_item[i])                                      ^     /usr/local/include/python3.4m/tupleobject.h:27:5: note: array 'ob_item' declared here         PyObject *ob_item[1];         ^     1 warning generated.  (blabla code)    libImaging/Unpack.c:867:1: warning: unused function 'copy3' [-Wunused-function]     copy3(UINT8* out, const UINT8* in, int pixels)     ^     1 warning generated. 

Answer 1

I was having this problem on a Mac with Python 3.6.4. The solution was to uninstall Pillow 5.1.0 and instead install 5.0.0.

pip uninstall Pillow pip install Pillow==5.0.0