Heroku push gets rejected

Question

I am having problem in pushing my master branch to heroku. I am using the following command:

git push heroku master

Error that I am encountering-

Counting objects: 114, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (112/112), done.
Writing objects: 100% (114/114), 335.40 KiB | 0 bytes/s, done.
Total 114 (delta 0), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Failed to detect set buildpack https://codon-buildpacks.s3.amazonaws.com/buildpacks/heroku/php.tgz
remote: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:

remote: !       Push rejected to skyconfapp.
remote:
To https://git.heroku.com/skyconfapp.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/skyconfapp.git'

I even visited Heroku's link https://devcenter.heroku.com/articles/buildpacks#detection-failure and tried to implement every method that they have mentioned but nothing seems to be working for me.

Can someone please assist?

Answer 1

If you are trying to push a nodejs app and you are getting this error, this could be because you are not specifying node version. I was having this error and it was being caused because I was not specifying "engines": { "node: "8.2.1" }

You can have more details here: https://kb.heroku.com/why-is-my-node-js-build-failing-because-of-an-invalid-semver-requirement