You run bundle install but get an error: Could not find gem 'rails (~> 6.1.0)' in any of the sources. What is the most likely cause?

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Ruby - Gems and Bundler

You run bundle install but get an error: Could not find gem 'rails (~> 6.1.0)' in any of the sources. What is the most likely cause?

AThe Gemfile is missing the source URL

BThe specified version of rails is not available in the gem sources

CYou forgot to run <code>bundle update</code> before install

DThe Ruby version is incompatible with rails

Step-by-Step Solution

Solution:

Step 1: Analyze the error message
The error says Bundler cannot find the gem 'rails' with version '~> 6.1.0' in any source.
Step 2: Identify common causes
This usually means the gem version is not published or available in the specified gem sources.
Final Answer:
The specified version of rails is not available in the gem sources -> Option B
Quick Check:
Missing gem version causes install error [OK]

Quick Trick: Check gem version availability if install fails [OK]

Common Mistakes:

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