"env: ‘/bin/flask’: No such file or directory" when running "npm run start-backend"

Im trying to find the most basic website template with Flask and React,Im using this repository and following installation instructions

https://github.com/Faruqt/React-Flask

Im using git Bash in Windows 10, and when running npm run start-backend it gives me the error:

> flask_react@0.1.0 start-backend> cd backend && env/bin/flask run --no-debuggerenv: ‘/bin/flask’: No such file or directory

I can't seem to find a solution online