The page you were looking for doesn't exist - heroku+rails - ruby-on-rails

Question

Good day. I am trying to deploy rails-application on heroku according to Hartl's book Ruby on Rails tutorial. I did $ git push heroku master and it was done correctly. But when i use $ heroku open there is a text
`The page you were looking for doesn't exist.
You may have mistyped the address or the page may have moved. When I start rails locally with $ rails s there are no mistakes and 127.0.0.1:3000 works nicely. But if I use $ rails s -e production there is a similar mistake
The page you were looking for doesn't exist. You may have mistyped the
address or the page may have moved.
Btw, according to similar's issues I tried to change
config.assets.compile = true
My Gemfile.lock:
remote: https://rubygems.org/
specs:
actionmailer (4.0.2)
actionpack (= 4.0.2)
mail (~> 2.5.4)
actionpack (4.0.2)
activesupport (= 4.0.2)
builder (~> 3.1.0)
erubis (~> 2.7.0)
rack (~> 1.5.2)
rack-test (~> 0.6.2)
activemodel (4.0.2)
activesupport (= 4.0.2)
builder (~> 3.1.0)
activerecord (4.0.2)
activemodel (= 4.0.2)
activerecord-deprecated_finders (~> 1.0.2)
activesupport (= 4.0.2)
arel (~> 4.0.0)
activerecord-deprecated_finders (1.0.3)
activesupport (4.0.2)
i18n (~> 0.6, >= 0.6.4)
minitest (~> 4.2)
multi_json (~> 1.3)
thread_safe (~> 0.1)
tzinfo (~> 0.3.37)
addressable (2.3.5)
arel (4.0.1)
atomic (1.1.14)
builder (3.1.4)
coffee-rails (4.0.1)
coffee-script (>= 2.2.0)
railties (>= 4.0.0, < 5.0)
coffee-script (2.2.0)
coffee-script-source
execjs
coffee-script-source (1.6.3)
erubis (2.7.0)
excon (0.25.3)
execjs (2.0.2)
heroku (3.2.1)
heroku-api (~> 0.3.7)
launchy (>= 0.3.2)
netrc (~> 0.7.7)
rest-client (~> 1.6.1)
rubyzip
heroku-api (0.3.15)
excon (~> 0.25.1)
hike (1.2.3)
i18n (0.6.9)
jbuilder (1.5.3)
activesupport (>= 3.0.0)
multi_json (>= 1.2.0)
jquery-rails (3.0.4)
railties (>= 3.0, < 5.0)
thor (>= 0.14, < 2.0)
json (1.8.1)
launchy (2.4.2)
addressable (~> 2.3)
mail (2.5.4)
mime-types (~> 1.16)
treetop (~> 1.4.8)
mime-types (1.25.1)
minitest (4.7.5)
multi_json (1.8.2)
netrc (0.7.7)
pg (0.17.1-x86-mingw32)
polyglot (0.3.3)
rack (1.5.2)
rack-test (0.6.2)
rack (>= 1.0)
rails (4.0.2)
actionmailer (= 4.0.2)
actionpack (= 4.0.2)
activerecord (= 4.0.2)
activesupport (= 4.0.2)
bundler (>= 1.3.0, < 2.0)
railties (= 4.0.2)
sprockets-rails (~> 2.0.0)
railties (4.0.2)
actionpack (= 4.0.2)
activesupport (= 4.0.2)
rake (>= 0.8.7)
thor (>= 0.18.1, < 2.0)
rake (10.1.1)
rdoc (3.12.2)
json (~> 1.4)
rest-client (1.6.7)
mime-types (>= 1.16)
rubyzip (1.1.0)
sass (3.2.13)
sass-rails (4.0.1)
railties (>= 4.0.0, < 5.0)
sass (>= 3.1.10)
sprockets-rails (~> 2.0.0)
sdoc (0.3.20)
json (>= 1.1.3)
rdoc (~> 3.10)
sprockets (2.10.1)
hike (~> 1.2)
multi_json (~> 1.0)
rack (~> 1.0)
tilt (~> 1.1, != 1.3.0)
sprockets-rails (2.0.1)
actionpack (>= 3.0)
activesupport (>= 3.0)
sprockets (~> 2.8)
sqlite3 (1.3.8-x64-mingw32)
sqlite3 (1.3.8-x86-mingw32)
sqlite3-ruby (1.3.3)
sqlite3 (>= 1.3.3)
thor (0.18.1)
thread_safe (0.1.3)
atomic
tilt (1.4.1)
treetop (1.4.15)
polyglot
polyglot (>= 0.3.1)
turbolinks (2.1.0)
coffee-rails
tzinfo (0.3.38)
uglifier (2.4.0)
execjs (>= 0.3.0)
json (>= 1.8.0)
PLATFORMS
x64-mingw32
x86-mingw32
DEPENDENCIES
coffee-rails (~> 4.0.0)
heroku
jbuilder (~> 1.2)
jquery-rails
pg
rails (= 4.0.2)
sass-rails (~> 4.0.0)
sdoc
sqlite3 (= 1.3.8)
sqlite3-ruby
turbolinks
uglifier (>= 1.3.0)
My Gemfile
source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.2'
# Use sqlite3 as the database for Active Record
group :development, :test do
gem 'sqlite3-ruby', :require => 'sqlite3'
gem 'sqlite3', '1.3.8'
end
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'
gem 'heroku'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.2'
group :doc do
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', require: false
end
# Use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.1.2'
# Use unicorn as the app server
# gem 'unicorn'
# Use Capistrano for deployment
# gem 'capistrano', group: :development
# Use debugger
# gem 'debugger', group: [:development, :test]
group :production do
gem 'pg'
end
routes.rb:
FirstApp::Application.routes.draw do
many comments
end
It's just created project with rails new. There is the same message if I try to get another pages.

Answer 1

I just ran into some similar issues a few weeks ago - it could be many things but here are some things that I forgot when doing this for the first time
Migrate your prod db heroku run rake db:migrate
make sure heroku has your precompiled assets - rake assets:precompile and push again to heroku
Also, check this section, Hartl mentions that you need a root route defined in order for the default rails page to work on heroku.