Quick Answer

Resolve missing file dependencies.

Understanding the Issue

Ruby cannot locate a required file. This happens when files are missing, paths are incorrect, or gems aren't installed.

The Problem

This code demonstrates the issue:

Ruby Error 
require "nonexistent_file" # LoadError

The Solution

Here's the corrected code:

Ruby Fixed 
# Solution 1: Check file existence
require "./lib/my_file" if File.exist?("./lib/my_file.rb")

# Solution 2: Add to load path
$LOAD_PATH.unshift(File.expand_path("../lib", __FILE__))
require "my_file"

# Solution 3: Install missing gem
# gem install missing_gem

# Solution 4: Relative vs absolute paths
require_relative "local_file"

Key Takeaways

Verify file paths and load paths when requiring files.