Error: That port is already in use.

System check identified no issues (0 silenced).
November 03, 2016 - 08:28:16
Django version 1.8.16, using settings 'workbench.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Error: That port is already in use.

A more simple solution just type sudo fuser -k 8000/tcp. This should kill all the processes associated with port 8000.

sudo lsof -t -i tcp:8000 | xargs kill -9

http://stackoverflow.com/questions/20239232/error-that-port-is-already-in-use