Installed Virtualenv and activating virtualenv doesn't work

Question

I cloned my Django Project from Github Account and activated the virtualenv using famous command source nameofenv/bin/activate And when I run python manage.py

Answer 1

I had installed Django 2 via pip3 install Django, but I was running python manage.py runserver instead of python3 manage.py runserver. Django 2 only works with python 3+.