ImportError: No module named 'django'

I need help.. I try to initialize the database on the PythonAnywhere server with the command $ python manage.py migrate... But I get the following message:
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'
What am I doing wrong?
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