Fixing: undefined method `require_gem’ for main:Object (NoMethodError)

After upgrading to the newest version of rails (2.2.2) I was getting this error:

administrator@shuttle:~$ rails -v/usr/bin/rails:17: undefined method `require_gem' for main:Object (NoMethodError)

Anytime I called “rails” I would get this error and could not get past.

Here is the fix

administrator@shuttle:~/$ sudo vim /usr/bin/rails

Look for anywhere in the file that calls “require_gem”, I found it in only one spot:

require_gem 'rails', version

And change “require_gem” to just “gem” so:

gem 'rails', version

Save and when you run “rails -v” you should see this:

administrator@shuttle:~/$ rails -vRails 2.2.2

You should no longer get the error with running “rails”

2 replies on “Fixing: undefined method `require_gem’ for main:Object (NoMethodError)”

  1. I get this error with rake. The require_gem method is the problem again. However your solution fixes it.

    # This file was generated by RubyGems.
    # The application ‘rake’ is installed as part of a gem, and
    # this file is here to facilitate running it.

    require ‘rubygems’
    version = “> 0”
    if ARGV.size > 0 && ARGV[0][0]==95 && ARGV[0][-1]==95
    if Gem::Version.correct?(ARGV[0][1..-2])
    version = ARGV[0][1..-2]
    require_gem ‘rake’, version
    load ‘rake’

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