'Coudn't find that formation' error when adding web dynos to Heroku flask app?

Question

I've just installed flask and heroku, and despite not having a problem with creating a simple app, now i download .zip file with ready code i wanted add and run this app on my heroku profile.

I get following error:

heroku ps:scale web=1
Scaling dynos... failed
   !    Couldn't find that formation.

Procfile:

web: gunicorn nameapp:app --log-file -

Answer 1

As you've anticipated, this almost certainly relates to your Procfile. Some obvious ones to check first (quoting Heroku.com):

A Procfile is a file named Procfile. It should be named Procfile exactly, and not anything else. For example, Procfile.txt is not valid. The file should be a simple text file. The file must be placed in the root directory of your application. It will not function if placed in a subdirectory.

If this doesn't help, it's possible that your Procfile is being ignored by git. See a similar question here: How to overcome 'Coudn't find that formation' error when adding web dynos to Heroku django app?