Module not found, though it is installed - Error installing Bench on OS X

I am following

i have installed bench, and did a bench init.
I hit a

(ModuleNotFoundError: No module named 'frappe')

Then ran

cd env 
source env/bin/activate
pip install -e ./apps/frappe --no-cache-dir
bench build

and resolved that error. ran

bench build
bench start

now i am getting this error
ModuleNotFoundError: No module named 'werkzeug'

pip3 install werkzeug
Requirement already satisfied: werkzeug in ./env/lib/python3.7/site-packages (0.16.1)

I am new to virtualenv and python.

I got this fixed,thanks to this wiki page

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