ImportError: No module named django.core.wsgi for uwsgi

I'm using uwsgi for my Django(version =1.4) project, but there's an error if I run ``` uwsgi --ini django.ini ``` ``` from django.core.wsgi import get_wsgi_application ImportError: No module named django.core.wsgi ``` but I could import django.core.wsgi as follows: ``` >>> import django.core.wsgi ``` the django.ini file: ``` [uwsgi] chdir=/path/to/my/app module=app.wsgi:application master=True vacuum=True max-requests=5000 socket=127.0.0.1:9000 ``` wsgi.py ``` import os os.environ.setdefault("DJANGO_SETTINGS_MODULE", "app.settings") # This application object is used by any WSGI server configured to use this # file. This includes Django's development server, if the WSGI_APPLICATION # setting points here. from django.core.wsgi import get_wsgi_application application = get_wsgi_application() ```