‘web:’ is not recognised as an internal or external command for Heroku

Solution for ‘web:’ is not recognised as an internal or external command for Heroku
is Given Below:

I am trying to create an app in heroku. And when I run on (anaconda command) this > (web: gunicorn app:app) it gives me error > ‘web:’ is not recognized as an internal or external command, operable program or batch file.