Ruby on Rails - uninitialized constant CarrierWave (NameError) on Heroku deploy - ruby-on-rails

Question

I am trying to deploy an app from a cloud9 Rails instance to Heroku. Deploy completes successfully, but the app crashes when started. Also, fail to load Heroku rails Console - see error below. I am new to R on R.
I had issues with imagemagick on local box and cloud9 until I did an install. Not sure how to accomplish that on Heroku instance and if that is really my issue. Thoughts, suggestions, question are welcomed.
$ heroku run rails console
Running rails console on ⬢ bttttt-xxxxxxxs-888888... up, run.9920 (Free)
/app/app/uploaders/image_uploader.rb:1:in `<top (required)>': uninitialized constant CarrierWave (NameError)
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.4/lib/active_support/concurrency/share_lock.rb:150:in `exclusive'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:11:in `loading'
from /app/app/models/restaurant.rb:2:in `<class:Restaurant>'
from /app/app/models/restaurant.rb:1:in `<top (required)>'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:12:in `block in loading'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.4/lib/active_support/concurrency/share_lock.rb:150:in `exclusive'
from /app/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:11:in `loading'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/engine.rb:476:in `block (2 levels) in eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/engine.rb:475:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/engine.rb:475:in `block in eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/engine.rb:473:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/engine.rb:473:in `eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/engine.rb:354:in `eager_load!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/application/finisher.rb:59:in `each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/application/finisher.rb:59:in `block in <module:Finisher>'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/initializable.rb:30:in `instance_exec'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/initializable.rb:30:in `run'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/initializable.rb:55:in `block in run_initializers'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `call'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
from /app/vendor/ruby-2.3.4/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/initializable.rb:54:in `run_initializers'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/application.rb:352:in `initialize!'
from /app/config/environment.rb:5:in `<top (required)>'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/application.rb:328:in `require'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/application.rb:328:in `require_environment!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/commands/commands_tasks.rb:157:in `require_application_and_environment!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/commands/commands_tasks.rb:77:in `console'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /app/vendor/bundle/ruby/2.3.0/gems/railties-5.0.4/lib/rails/commands.rb:18:in `<top (required)>'
from /app/bin/rails:9:in `require'
from /app/bin/rails:9:in `<main>'
Gemfile code -
source 'https://rubygems.org'
git_source(:github) do |repo_name|
repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
"https://github.com/#{repo_name}.git"
end
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.1'
# Use sqlite3 as the database for Active Record
#gem 'sqlite3'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platform: :mri
gem 'sqlite3'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
gem 'web-console', '>= 3.3.0'
gem 'listen', '~> 3.0.5'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'carrierwave'
gem 'mini_magick'
gem 'spring-watcher-listen', '~> 2.0.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
group :production do
gem 'pg', '0.20.0'
end

Answer 1

uninitialized constant CarrierWave (NameError)
You have put the gem 'carrierwave' under the group :development, so that the gem isn't bundled in the production. This is the reason for the error.
Solution:
Move it outside the development group
source 'https://rubygems.org'
git_source(:github) do |repo_name|
repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
"https://github.com/#{repo_name}.git"
end
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.0.1'
# Use sqlite3 as the database for Active Record
#gem 'sqlite3'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'
gem 'carrierwave'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platform: :mri
gem 'sqlite3'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
gem 'web-console', '>= 3.3.0'
gem 'listen', '~> 3.0.5'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'mini_magick'
gem 'spring-watcher-listen', '~> 2.0.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
group :production do
gem 'pg', '0.20.0'
end
Or
Add it to both development and production groups
group :development, :production do
gem 'carrierwave'
end
And finally run bundle install