Ruby on Rails

Hi EveryBody,

I hope some one help me.

I am new on ROR so might be problem is silly or Obvious. i had
developed a project and i had use "WILL_PAGINATE" plugin in my app.
It's working well at localhost.

But when deploying on HEROKU, ALL step is going well but when running

$heroku rake db:migrate

ERROR IS

Missing these required gems:
will_paginate

You're running:
ruby 1.8.6.253 at /usr/local/bin/ruby
rubygems 1.3.7 at /app/bundle/gems/ruby/1.8, /app/.bundle/gems,
/app/gems, /usr/ruby1.8.7/lib/ruby/gems/1.8

Run `rake gems:install` to install the missing gems.
(in /app)

MY environment.rb file is like that

# Be sure to restart your server when you modify this file

# Specifies gem version of Rails to use when vendor/rails is not present
RAILS_GEM_VERSION = '2.3.8' unless defined? RAILS_GEM_VERSION

# Bootstrap the Rails environment, frameworks, and default configuration
require File.join(File.dirname(__FILE__), 'boot')

Rails::Initializer.run do |config|

config.gem 'will_paginate'

# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.

# Add additional load paths for your own custom dirs
# config.load_paths += %W( #{RAILS_ROOT}/extras )

# Specify gems that this application depends on and have them
installed with rake gems:install
# config.gem "bj"
# config.gem "hpricot", :version => '0.6', :source =>
"http://code.whytheluckystiff.net"
# config.gem "sqlite3-ruby", :lib => "sqlite3"
# config.gem "aws-s3", :lib => "aws/s3"

# Only load the plugins named here, in the order given (default is
alphabetical).
# :all can be used as a placeholder for all plugins not explicitly named
# config.plugins = [ :exception_notification, :ssl_requirement, :all ]

# Skip frameworks you're not going to use. To use Rails without a database,
# you must remove the Active Record framework.
# config.frameworks -= [ :active_record, :active_resource, :action_mailer ]

# Activate observers that should always be running
# config.active_record.observers = :cacher, :garbage_collector,
:forum_observer

# Set Time.zone default to the specified zone and make Active Record
auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names.
config.time_zone = 'UTC'

# The default locale is :en and all translations from
config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}')]
# config.i18n.default_locale = :de

end

I google lot's but d't find sol.
Please help me.

thanks

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