ImportError: No module named django.core.management

i am working with someones source code .i getting errors in the initial steps .i followed  the installation instructions .and they instructed to create the virtual environment .After i setted the virtualenv  i installed all requirements given in the requirements.txt  .when i running this initial command

 python manage.py syncdb

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

 

 now what can i do.

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