Heroku Django webapp getting error logs say gunicorn command not found but it is there

Question

I am trying to run a django app on heroku with postgresql but i'm getting when i go to my app url i check the heroku logs --tail and see

2018-08-27T10:37:19.086599+00:00 heroku[web.1]: State changed from starting to crashed 2018-08-27T10:37:19.070449+00:00 heroku[web.1]: Process exited with status 127 2018-08-27T10:37:18.986150+00:00 app[web.1]: bash: gunicorn: command not found i have a requirements.txt with gunicorn, the heroku python buildpack installed

i try maybe installing gunicorn remotely with heroku run pip install -r requirements.txt

but i get › Error: remote requirements.txt not found in git remotes

Answer 1

I'm also working with Django and saw this same exact error in heroku logs --tail a few minutes after I pushed updated to Heroku. Prior to the push to Heroku everything worked just fine.

To solve this problem, first I made sure that the following files that worked previously remain unchanged with the push:

• requirements.txt
• Aptfile
• Procfile
• runtime
• wsgi

Since these files remained unchanged, I concluded that something beyond my knowledge was causing issues. So I went into the app's Activity Feed in Heroku, found the version that I knew worked and clicked on the Roll back to here link.

When that didn't work, per the recommendation of another user (whose comment I can't seem to find now), I removed all packages from the requirements.txt then pushed it up to Heroku so that all packages would be uninstalled in the app. Then I added back all packages to the requirements.txt and pushed it to Heroku. Now it works.