[git] Can't push to the heroku

I was pushing the current git repository into the heroku. That online application was developed using Scala and IntelliJ. And I don't know how to fix this error.

$ git push heroku master
Counting objects: 3, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3/3), done.
Writing objects: 100% (3/3), 531 bytes | 0 bytes/s, done.
Total 3 (delta 0), reused 0 (delta 0)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote:  !     No default language could be detected for this app.
remote:             HINT: This occurs when Heroku cannot detect the         buildpack to use for this application automatically.
remote:             See https://devcenter.heroku.com/articles/buildpacks
remote: 
remote:  !     Push failed
remote: Verifying deploy....
remote: 
remote: !   Push rejected to salty-coast-14102.
remote: 
To https://git.heroku.com/salty-coast-14102.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/salty-coast-14102.git'

This question is related to git scala heroku intellij-idea

The answer is


Make sure you have package.json inside root of your project. Happy coding :)


If you are using django app to deploy on heroku

make sure to put request library in the requirements.txt file.


You need to follow the instructions displayed here, on your case follow scala configuration:

https://devcenter.heroku.com/articles/getting-started-with-scala#introduction

After setting up the getting started pack, tweak around the default config and apply to your local repository. It should work, just like mine using NodeJS.

HTH! :)


If your app is a Scala app, it must have a build.sbt in the root directory, and that file must be checked into Git. You can confirm this by running:

$ git ls-files build.sbt

If that file exists and is checked into Git, try running this command:

$ heroku buildpacks:set heroku/scala

You could also select webpack build manually from the UI enter image description here


There has to be a .git directory in the root of your project.

If you don't see that directory run git init and then re-associate your remote.

Like so:

heroku git:remote -a herokuAppName
git push heroku master

If you are a python user -
Create a requirements.txt file preferably using pip freeze > requirements.txt.
Add, commit and try pushing it again.

If this doesn't work try deleting .git (beware this might remove the associated git history) and follow the above steps again.

Worked for me.


Read this doc which will explain to you what to do.
https://devcenter.heroku.com/articles/buildpacks

Setting a buildpack on an application

You can change the buildpack used by an application by setting the buildpack value.
When the application is next pushed, the new buildpack will be used.

$ heroku buildpacks:set heroku/php

Buildpack set. Next release on random-app-1234 will use heroku/php.
Run git push heroku master to create a new release using this buildpack.

This is whay its not working for you since you did not set it up.

... When the application is next pushed, the new buildpack will be used.

You may also specify a buildpack during app creation:

$ heroku create myapp --buildpack heroku/python

Specify the buildpack while creating the app.

heroku create appname --buildpack heroku/python

Examples related to git

Does the target directory for a git clone have to match the repo name? Git fatal: protocol 'https' is not supported Git is not working after macOS Update (xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools) git clone: Authentication failed for <URL> destination path already exists and is not an empty directory SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443 GitLab remote: HTTP Basic: Access denied and fatal Authentication How can I switch to another branch in git? VS 2017 Git Local Commit DB.lock error on every commit How to remove an unpushed outgoing commit in Visual Studio?

Examples related to scala

Intermediate language used in scalac? Why does calling sumr on a stream with 50 tuples not complete Select Specific Columns from Spark DataFrame Joining Spark dataframes on the key Provide schema while reading csv file as a dataframe how to filter out a null value from spark dataframe Fetching distinct values on a column using Spark DataFrame Can't push to the heroku Spark - Error "A master URL must be set in your configuration" when submitting an app Add jars to a Spark Job - spark-submit

Examples related to heroku

How to fix error "ERROR: Command errored out with exit status 1: python." when trying to install django-heroku using pip Can't push to the heroku ImproperlyConfigured: You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings How to enable CORS in flask Error: Cannot pull with rebase: You have unstaged changes How to solve error "Missing `secret_key_base` for 'production' environment" (Rails 4.1) Failed to execute 'postMessage' on 'DOMWindow': The target origin provided does not match the recipient window's origin ('null') 'heroku' does not appear to be a git repository Heroku 'Permission denied (publickey) fatal: Could not read from remote repository' woes How do I set up DNS for an apex domain (no www) pointing to a Heroku app?

Examples related to intellij-idea

IntelliJ: Error:java: error: release version 5 not supported Has been compiled by a more recent version of the Java Runtime (class file version 57.0) Error: Java: invalid target release: 11 - IntelliJ IDEA IntelliJ can't recognize JavaFX 11 with OpenJDK 11 Error: JavaFX runtime components are missing, and are required to run this application with JDK 11 ERROR Source option 1.5 is no longer supported. Use 1.6 or later Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6 How to configure "Shorten command line" method for whole project in IntelliJ intellij idea - Error: java: invalid source release 1.9 Failed to resolve: com.google.android.gms:play-services in IntelliJ Idea with gradle