How do I fix the 'uninitialized constant ActiveSupport::LoggerThreadSafeLevel::Logger' error when creating a new Rails project?

It looks like there’s a version mismatch issue. Your terminal shows you have Rails 7.2.2.1 installed (as verified with rails -v), but you’re invoking the command with 7.0.4 (rails 7.0.4 new sample_app). This mix-up can lead to dependency conflicts—such as ActiveSupport trying to reference a Logger constant—that aren’t meant to happen.

Here are a few suggestions to resolve the problem:

1. Use the Installed Version Consistently:
   Instead of specifying version 7.0.4, simply run the project generator with your installed Rails version. Try creating your project with:

   BASHCopied
   rails new sample_app --skip-bundle

   This will use Rails 7.2.2.1 (the version you confirmed) and avoid conflicts.

2. Check Your Installed Versions:
   It may be that you have multiple Rails versions installed. You can list them with:

   BASHCopied
   gem list rails

   If you see an older version (like 7.0.4) and don't intend to use it, you can uninstall that version:

   BASHCopied
   gem uninstall rails -v 7.0.4

3. Avoid Modifying Gem Files for a New Project:
   Since you’re creating your project from scratch, there isn’t a Gemfile to edit yet. The workaround you read about (editing the Gemfile or specifying a different gem version dependency) should be applied only after a project has been created. The best solution in your case is to ensure the Rails version command is consistent.

Following these steps should help you create a new Rails project without running into the ActiveSupport error. Make sure that when you run commands related to project creation, you’re using the same Rails version that you verified with rails --version.