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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T03:45:11+00:00 2026-05-28T03:45:11+00:00

I’m new to creating a rails application. I’m going through this tutorial , and

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I’m new to creating a rails application. I’m going through this tutorial, and running into the issue when launching rails server. When I execute the commands (rails server or bundle exec rails server) I get the following error:

←[31mCould not find rack-cache-1.0.3 in any of the sources←[0m
←[33mRun `bundle install` to install missing gems.←[0m

I’m not sure why this is happening, because rack-cache is installed. I’ve already run bundle install, but that doesn’t fix anything.

This is my gemfile

source 'http://rubygems.org'

gem 'rails', '3.1.0'

# Bundle edge Rails instead:
# gem 'rails',     :git => 'git://github.com/rails/rails.git'

gem 'sqlite3'

gem 'json'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails', "  ~> 3.1.0"
  gem 'coffee-rails', "~> 3.1.0"
  gem 'uglifier'
end

gem 'jquery-rails'

# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'ruby-debug'

my gem list is:

abstract (1.0.0)
actionmailer (3.1.0, 3.0.0)
actionpack (3.1.0, 3.0.0)
activemodel (3.1.0, 3.0.0)
activerecord (3.1.0, 3.0.0)
activeresource (3.1.0, 3.0.0)
activesupport (3.1.0, 3.0.9, 3.0.0)
arel (2.2.1, 1.0.1)
bcrypt-ruby (3.0.1 x86-mingw32)
builder (3.0.0, 2.1.2)
bundler (1.0.18)
childprocess (0.2.2)
coffee-rails (3.1.1)
coffee-script (2.2.0)
coffee-script-source (1.1.2)
commonwatir (2.0.2, 1.9.2)
diff-lcs (1.1.2)
erubis (2.7.0, 2.6.6)
execjs (1.2.9)
ffi (1.0.9 x86-mingw32)
firewatir (1.9.4, 1.9.2)
hike (1.2.1)
hoe (2.10.0)
i18n (0.6.0, 0.4.2)
jquery-rails (1.0.14)
mail (2.3.0, 2.2.19)
metaclass (0.0.1)
mime-types (1.16)
mocha (0.9.12)
multi_json (1.0.3)
nokogiri (1.5.0 x86-mingw32)
polyglot (0.3.2)
rack (1.3.3, 1.2.4)
rack-cache (1.1)
rack-mount (0.8.3, 0.6.14)
rack-ssl (1.3.2)
rack-test (0.6.1, 0.5.7)
rails (3.1.0, 3.0.0)
railties (3.1.0, 3.0.0)
rake (0.9.2)
rautomation (0.6.3)
rdoc (3.9.4)
rspec (2.6.0)
rspec-core (2.6.4)
rspec-expectations (2.6.0)
rspec-mocks (2.6.0)
rubigen (1.5.6)
rubyzip (0.9.4)
s4t-utils (1.0.4)
sass (3.1.7)
sass-rails (3.1.2)
selenium-webdriver (2.6.0)
sprockets (2.0.0)
sqlite3 (1.3.4 x86-mingw32)
taglob (1.1.2)
taza (0.8.7)
term-ansicolor (1.0.6)
thor (0.14.6)
treetop (1.4.10)
tzinfo (0.3.29)
uglifier (1.0.3)
user-choices (1.1.6.1)
watir (2.0.2, 1.9.2)
watir-webdriver (0.3.3)
win32-api (1.4.8 x86-mingw32)
win32-process (0.6.5)
win32console (1.3.0 x86-mingw32)
windows-api (0.4.0)
windows-pr (1.2.0)
xml-simple (1.1.0)
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  1. Editorial Team
    Editorial Team
    2026-05-28T03:45:11+00:00Added an answer on May 28, 2026 at 3:45 am

    Make sure you are not getting any of these:
    Invalid gemspec in [/var/lib/gems/1.8/specifications/rack-cache-1.0.3.gemspec]: invalid date format in specification: “2011-08-27 00:00:00.000000000Z”

    If so, edit the gemspec file and change the dates to “2011-08-27” removing 00:00:00.000000000Z

    This is the same for any of the gems, not just rack-cache.

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