failed push to heroku using rails 4 - ruby-on-rails

Question

i try to deploy my rails app to heroku, but when git push heroku master i get error like this :
-----> Ruby app detected
-----> Compiling Ruby/Rails
-----> Using Ruby version: ruby-2.0.0
-----> Installing dependencies using Bundler version 1.3.2
New app detected loading default bundler cache
Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin --deployment
You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.
You have added to the Gemfile:
* pg
* carrierwave
* debugger
* rails_12factor
Bundler Output: You are trying to install in deployment mode after changing
your Gemfile. Run `bundle install` elsewhere and add the
updated Gemfile.lock to version control.
You have added to the Gemfile:
* pg
* carrierwave
* debugger
* rails_12factor
!
! Failed to install gems via Bundler.
!
! Push rejected, failed to compile Ruby app
why i get error like this? i already to try bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin --deployment and run git push heroku master again but i still get same error like before???
i'm using ruby 2.0 and rails 4, please tell me if i'm wrong? thanks before
Edit:
my gemfile:
source 'rubygems.org';
gem 'rails', '4.0.1'
group :development do
gem 'sqlite3'
end
group :production do
gem 'pg'
end
gem 'sass-rails', '~> 4.0.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 1.2'
group :doc do
gem 'sdoc', require: false
end
gem 'devise'
gem "twitter-bootstrap-rails"
gem 'carrierwave'
gem 'debugger',
group: [:development, :test] gem 'rails_12factor'

Answer 1

You can simply delete Gemfile.lock file then commit and push to heroku again.