If you are using Linux OS:
- Remove
matplotlib==1.3.1fromrequirements.txt - Try to install with
sudo apt-get install python-matplotlib - Run
pip install -r requirements.txt(Python 2), orpip3 install -r requirements.txt(Python 3) pip freeze > requirements.txt
If you are using Windows OS:
python -m pip install -U pip setuptoolspython -m pip install matplotlib