ImportError: No module named 'oscar'

[jiangta...@gmail.com]

(oscar)[root@node02 django-oscar]# sandbox/manage.py runserver

Traceback (most recent call last):

  File "sandbox/manage.py", line 10, in <module>

    execute_from_command_line(sys.argv)

  File "/root/django-oscar/oscar/lib/python3.5/site-packages/django/core/management/__init__.py", line 363, in execute_from_command_line

    utility.execute()

  File "/root/django-oscar/oscar/lib/python3.5/site-packages/django/core/management/__init__.py", line 307, in execute

    settings.INSTALLED_APPS

  File "/root/django-oscar/oscar/lib/python3.5/site-packages/django/conf/__init__.py", line 56, in __getattr__

    self._setup(name)

  File "/root/django-oscar/oscar/lib/python3.5/site-packages/django/conf/__init__.py", line 41, in _setup

    self._wrapped = Settings(settings_module)

  File "/root/django-oscar/oscar/lib/python3.5/site-packages/django/conf/__init__.py", line 110, in __init__

    mod = importlib.import_module(self.SETTINGS_MODULE)

  File "/root/django-oscar/oscar/lib64/python3.5/importlib/__init__.py", line 126, in import_module

    return _bootstrap._gcd_import(name[level:], package, level)

  File "<frozen importlib._bootstrap>", line 986, in _gcd_import

  File "<frozen importlib._bootstrap>", line 969, in _find_and_load

  File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>", line 673, in _load_unlocked

  File "<frozen importlib._bootstrap_external>", line 662, in exec_module

  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed

  File "/root/django-oscar/sandbox/settings.py", line 3, in <module>

    import oscar

ImportError: No module named 'oscar'

thank you