no translation file found for domain 'django'

I copied the django distribute into my project folder
thinking it will work well
it works perfectly in one of my machine ,but throw an error below in another one

Traceback (most recent call last):    File "manage.py", line 12, in <module>      execute_from_command_line(sys.argv)    File "cmdb_lib/django/core/management/__init__.py", line 338, in execute_from_command_line      utility.execute()    File "cmdb_lib/django/core/management/__init__.py", line 330, in execute      self.fetch_command(subcommand).run_from_argv(self.argv)    File "cmdb_lib/django/core/management/commands/test.py", line 30, in run_from_argv      super(Command, self).run_from_argv(argv)    File "cmdb_lib/django/core/management/base.py", line 393, in run_from_argv      self.execute(*args, **cmd_options)    File "cmdb_lib/django/core/management/commands/test.py", line 74, in execute      super(Command, self).execute(*args, **options)    File "cmdb_lib/django/core/management/base.py", line 458, in execute      translation.activate(saved_locale)    File "cmdb_lib/django/utils/translation/__init__.py", line 146, in activate      return _trans.activate(language)    File "cmdb_lib/django/utils/translation/trans_real.py", line 222, in activate      _active.value = translation(language)    File "cmdb_lib/django/utils/translation/trans_real.py", line 206, in translation      _translations[language] = DjangoTranslation(language)    File "cmdb_lib/django/utils/translation/trans_real.py", line 115, in __init__      self._init_translation_catalog()    File "cmdb_lib/django/utils/translation/trans_real.py", line 153, in _init_translation_catalog      translation = self._new_gnu_trans(localedir, use_null_fallback)    File "cmdb_lib/django/utils/translation/trans_real.py", line 136, in _new_gnu_trans      fallback=use_null_fallback)    File "/usr/local/lib/python2.7/gettext.py", line 472, in translation      raise IOError(ENOENT, 'No translation file found for domain', domain)  IOError: [Errno 2] No translation file found for domain: u'django'

but in my settins.py I set LANGUAGE_CODE = 'en-us' as default!
how could this throw an error
I tried to pip install django , problem solved ,but I still want to include the django packege in my project
how can I achieve  this?

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