Software⏱️ 2 min read📅 2026-06-03

How to Fix: Heroku deployment error H10 (App crashed)

Heroku deployment error H10 indicates a crashed app. Check the Heroku logs for more information and ensure your Ruby on Rails app is properly configured.

Quick Answer: Verify that New Relic RPM is installed correctly and configure it to work with your Rails app. Also, check for any memory leaks or issues in your code.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

Heroku deployment error H10 (App crashed) occurs when the application fails to start or crashes during the startup process. This error is typically caused by issues such as incorrect configuration, missing dependencies, or compatibility problems with the Heroku environment.

⚠️ Common Causes

  • Incorrect configuration or missing dependencies in the application's Gemfile.

✅ Best Solutions to Fix It

Method 1: Verify Configuration and Dependencies

  1. Step 1: Review the application's configuration files, such as config/environments.rb and config/initializers.rb, to ensure that all dependencies are correctly specified.

Method 2: Use Heroku's Built-in Tools

  1. Step 1: Run the command `heroku run bundle install` to ensure that all dependencies are installed and up-to-date.

✨ Wrapping Up

By following these steps, you should be able to identify and resolve the cause of the Heroku deployment error H10 (App crashed) and successfully deploy your application.

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