Heroku push rejected, no Cedar-supported app detected

Question

I'm creating a Rails app with Rails 3.1.3:

git init
git remote add heroku <my heroku repo>
git add .
git commit -a -m "First commit"
git push heroku master

Got:

Counting objects: 102, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (86/86), done.
Writing objects: 100% (102/102), 315.47 KiB, done.
Total 102 (delta 3), reused 0 (delta 0)

**-----> Heroku receiving push
 !     Heroku push rejected, no Cedar-supported app detected**

To git@heroku.com:electric-dusk-3217.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to <my heroku rep>

I've created app on the cedar stack: heroku create --stack cedar — WHITECOLOR, Dec 02 '11 at 19:29

JnBrymn · Answer 1 · 2015-09-03T12:37:02.463

154

I had a similar problem, but with Django (incorrectly named "requirements.txt"). I think to generalize the other answers here, when you get this error it's because Heroku is missing some key file that it uses to identify your app (and its type).

php: index.php
python: requirements.txt
ruby: Gemfile # note the capitalization
node: package.json

edited Sep 03 '15 at 12:37

answered Nov 18 '12 at 02:34

JnBrymn

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Found another answer to this problem here (re-initialize the git repo): http://stackoverflow.com/questions/9305370/rails-3-2-heroku-push-rejected-no-cedar-supported-app-detected – Chris Sep 20 '13 at 01:55
Friendly reminder: also have a Procfile, if running web app be sure there is a webservice enabled via Procfile pointing to correct script. Also be sure web dyno is turned on for app in Heroku admin. ```remote: ----->Discovering process types...Procfile declares types -> web``` is via my Procfile – Marc Jul 13 '15 at 18:06
Thanks, adding requirements.txt helped me! Please note that you should commit it (add it to the git repo) and then try to push again.. – ItayB Feb 07 '16 at 17:08

score 48 · Accepted Answer · answered Dec 02 '11 at 20:01

48

The problem was that my "Gemfile" was named "gemfile"

answered Dec 02 '11 at 20:01

WHITECOLOR

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@Whitecolor Had the exact same issue and your solution worked! Then ran into other complicated problems after. But thank you. – Tony Jan 11 '12 at 07:21
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Not only did this happen for me, but in a non-obvious way. Working in OSX, even with a file called `Gemfile`, if I do `vi gemfile`, it opens my `Gemfile`, and then upon saving renames it to `gemfile` without warning! – B Seven Sep 23 '12 at 18:21
I guess this is a good reason to set up a partition that distinguishes between uppercase and lowercase characters... – B Seven Sep 23 '12 at 18:21
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what's the "Gemfile" ? i have a html game and i want to push it in heroku. and i get the same error – Alaeddine Mar 24 '14 at 10:49

score 45 · Answer 3 · answered Jan 31 '12 at 04:34

45

I ran into this error message, but my problem was that my rails app was not in the root directory of my git repo. After I moved the files into the root dir, everything worked.

answered Jan 31 '12 at 04:34

ncherro

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That seems like a poor solution. Is there a proper way to push the app while its in a subdirectory? – y0mbo Apr 27 '12 at 21:06
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I'm using [git-subtree](https://github.com/apenwarr/git-subtree). I had trouble installing so I used [this help](http://stackoverflow.com/questions/11603510/how-do-i-correctly-install-the-tools-in-gits-contrib-directory) – Rian Rainey Oct 21 '12 at 22:43
I had the same problem - I was just starting with the heroku getting started for RoR and encountered this issue. Thanks for the fix. – Mahendra Liya Nov 06 '13 at 20:22
I kept checking the commandline and it was "correct" but then I noticed I was in /home/myapp/myapp... doh... – Will Dec 23 '15 at 09:27
My case, too. I `git init` my app folder as git root directory then the push to heroku went through. Thanks. – Sophia Feng Jan 31 '16 at 02:46

score 26 · Answer 4 · answered Jul 18 '13 at 23:53

26

Heroku detects a supported app by looking for specific project files. To find the requirements for your language, start here.

For Node.js, you need a package.json.
For Python applications you need a requirements.txt.
etc.

answered Jul 18 '13 at 23:53

Patrick Fisher

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score 22 · Answer 5 · answered Jan 11 '14 at 17:33

Not associated with a new app, but... I ran into this same error message after installing a custom BUILDPACK on heroku and then forgetting about it. The next time I went to deploy to heroku I saw:

-----> Fetching custom git buildpack... done

 !     Push rejected, no Cedar-supported app detected

The fix was to check:

 heroku config

And, there, I found a Var called BUILDPACK_URL which I had to unset with:

heroku config:unset BUILDPACK_URL

... and voila!

Wow, that was a tough one. Thanks! – Alexander Presber Sep 10 '14 at 12:14 — Alexander Presber, Sep 10 '14 at 12:14

japhyr · Answer 6 · 2015-03-02T00:44:07.797

12

Another cause: I was pushing master, while working on a non-master branch. My master branch didn't have requirements.txt.

I didn't want to push from master, but heroku only pays attention to the master branch. The solution was to push my local branch to heroku's master branch:

git push heroku local_branch:master

edited Mar 02 '15 at 00:44

answered Mar 02 '15 at 00:39

japhyr

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You are my hero ! I spent hours try to find this > – Laurent Apr 10 '15 at 13:40

score 7 · Answer 7 · answered Mar 28 '13 at 03:19

7

Another cause of this error for Rails apps: we had this deploy error occur when we hadn't removed a git merge conflict from our Gemfile.lock file.

answered Mar 28 '13 at 03:19

James P McGrath

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score 3 · Answer 8 · answered Jun 24 '12 at 17:10

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I had the same issue. "Gemfile" was included in ".gitignore" and has therefore not been part of the deployment. Heroku requires Gemfile for Rails projects.

answered Jun 24 '12 at 17:10

Alexei Danchenkov

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score 3 · Answer 9 · answered Jun 17 '13 at 17:01

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I fixed this by making a superficial change to my Gemfile and recommitting. For some reason it wasn't included in my last commit.

answered Jun 17 '13 at 17:01

Dan Sandland

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score 3 · Answer 10 · answered Mar 28 '14 at 15:53

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I met the same problem here.
My check as follow:
1. Make sure "foreman start" works well locally.
2. Make sure only one new app create on your heroku account.
Hope it help.

answered Mar 28 '14 at 15:53

Evan Lin

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score 3 · Answer 11 · edited May 23 '17 at 11:58

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I was following the RailsTutorial.org steps and this error showed up. None of the answers on this post worked. Then I saw this comment that led to this answer which was the only thing that worked for me so that might solve other people's problems with the tutorial as well.

edited May 23 '17 at 11:58

Community

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answered Feb 26 '15 at 14:22

2016rshah

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I think the cause is that I init the repo on parent directory of the RAIL_PROJECT directory. So make cedar can't recognize what type of the app is. Thanks for your answer! – Robert Mar 10 '16 at 06:08

score 3 · Answer 12 · answered Oct 30 '15 at 07:29

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When this problem appears with the project based on static files (only html, css and js) it is recommended to follow this guidlines: https://discussion.heroku.com/t/push-rejected-no-cedar-supported-app-detected/640/3

answered Oct 30 '15 at 07:29

Tomasz Kowalczyk

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score 2 · Answer 13 · answered Jan 22 '15 at 10:38

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I also had the problem with django based app. Everything seemed to be ok: file names and other settings.

The problem was that in heroku console there was a BUILDPACK_URL setting defined for node.js - thus django application was rejected.

answered Jan 22 '15 at 10:38

Opal

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Heroku push rejected, no Cedar-supported app detected

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