error running python manage.py runserver 0.0.0.0:8000 --set

(ap)vagrant@vagrant-ubuntu-trusty-64:~/ap/ap$ python manage.py runserver 0.0.0.0:8000 --settings=ap.settings.dev
/home/vagrant/ap/ap
/home/vagrant/ap/ap
Validating models...

0 errors found
March 18, 2015 - 05:55:24
Django version 1.6.10, using settings 'ap.settings.dev'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
Unhandled exception in thread started by <function wrapper at 0x7f818311c5f0>
Traceback (most recent call last):
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 93, in wrapper
    fn(*args, **kwargs)
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 126, in inner_run
    handler = self.get_handler(*args, **options)
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/contrib/staticfiles/management/commands/runserver.py", line 24, in get_handler
    handler = super(Command, self).get_handler(*args, **options)
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 45, in get_handler
    return get_internal_wsgi_application()
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/core/servers/basehttp.py", line 57, in get_internal_wsgi_application
    error_prefix="WSGI application '%s' could not be loaded; " % app_path
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/utils/module_loading.py", line 26, in import_by_path
    sys.exc_info()[2])
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/utils/module_loading.py", line 21, in import_by_path
    module = import_module(module_path)
  File "/home/vagrant/.virtualenvs/ap/local/lib/python2.7/site-packages/django/utils/importlib.py", line 40, in import_module
    __import__(name)
  File "/home/vagrant/ap/ap/ap/wsgi.py", line 38, in <module>
    from dj_static import Cling
django.core.exceptions.ImproperlyConfigured: WSGI application 'ap.wsgi.application' could not be loaded; Error importing module ap.wsgi: "No module named dj_static"
^C(ap)vagrant@vagrant-ubuntu-trusty-64:~/ap/ap$ exit
logout
Connection to 127.0.0.1 closed.