我试图python manage.py runserver在我拥有的Django应用程序上运行，但出现此错误：

Traceback (most recent call last):
File "manage.py", line 8, in <module>
 from django.core.management import execute_from_command_line
ImportError: No module named django.core.management

以下是pip freeze | grep -i django显示我确实安装了Django的输出：

Django==1.6.5
django-cached-authentication-middleware==0.2.0
django-cors-headers==1.1.0
django-htmlmin==0.7.0
django-static-precompiler==0.9
djangorestframework==2.3.14

此外，尝试运行会/usr/local/bin/python2.7 manage.py runserver产生相同的错误。