Django 1.4 Unknown command: 'runserver'

Question

Something in my python path must have changed because now I cannot run the.

python app/manage.py runserver

The output I get is

Answer 1

I agreed with OP. I met the same problem, and it turned out to be an error in settings.py:
In settings.py I use os.environ[something] and those environment variables are loaded in apache start script. If I run manage.py from the command line, it doesn't know what is os.environ[something] thus error occurs.

So for anyone here searching for solution, suggestion is to check circumstance difference between running django project and pure manage.py, maybe you'll find what's wrong.