Rails 4, capistrano error: cannot load such file -- deploy/assets - ruby-on-rails

Question

I've been following this railscast here on deploying to a VPS http://railscasts.com/episodes/335-deploying-to-a-vps and I seem to be stuck on on deploying. When I type in cap deploy, I get this.
cap aborted!
cannot load such file -- deploy/assets
/files/rails/Capfile:2:in `load'
/files/rails/Capfile:2:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/capistrano-3.0.1/lib/capistrano/application.rb:22:in `load_rakefile'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/capistrano-3.0.1/lib/capistrano/application.rb:12:in `run'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/capistrano-3.0.1/bin/cap:3:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.0.0-p247/bin/cap:23:in `load'
/usr/local/rvm/gems/ruby-2.0.0-p247/bin/cap:23:in `<main>'
(See full trace by running task with --trace)
My deploy.rb
require "bundler/capistrano"
server "(removed)", :web, :app, :db, primary: true
set :application, "Fooddiscovery"
set :user, "(removed)"
set :deploy_to, "/home/rails"
set :deploy_via, :remote_cache
set :use_sudo, false
set :scm, "git"
set :repository, "(removed)"
set :branch, "master"
default_run_options[:pty] = true
ssh_options[:forward_agent] = true
after "deploy", "deploy:cleanup" # keep only the last 5 releases
namespace :deploy do
%w[start stop restart].each do |command|
desc "#{command} unicorn server"
task command, roles: :app, except: {no_release: true} do
run "/etc/init.d/unicorn_#{application} #{command}"
end
end
task :setup_config, roles: :app do
sudo "ln -nfs #{current_path}/config/nginx.conf /etc/nginx/sites-enabled/#{application}"
sudo "ln -nfs #{current_path}/config/unicorn_init.sh /etc/init.d/unicorn_#{application}"
run "mkdir -p #{shared_path}/config"
put File.read("config/database.example.yml"), "#{shared_path}/config/database.yml"
puts "Now edit the config files in #{shared_path}."
end
after "deploy:setup", "deploy:setup_config"
task :symlink_config, roles: :app do
run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
end
after "deploy:finalize_update", "deploy:symlink_config"
desc "Make sure local git is in sync with remote."
task :check_revision, roles: :web do
unless `git rev-parse HEAD` == `git rev-parse origin/master`
puts "WARNING: HEAD is not the same as origin/master"
puts "Run `git push` to sync changes."
exit
end
end
before "deploy", "deploy:check_revision"
end
My capfile
load 'deploy' if respond_to?(:namespace)
load 'deploy/assets'
load 'config/deploy'
I read other questions and answers that said to add
if respond_to?(:namespace)
which did actually help with the first error where instead of deploy/assets, it use to show errors for just deploy ( cannot load such file -- deploy ). Putting in if respond_to?(:namespace) for all three links does not solve the issue. In fact a new error shows if I do that telling me undefined local variable or method `tasks_without_stage_dependency'.
Thanks!

Answer 1

#Michael's correct that you're using Capistrano 2 syntax with Capistrano 3, but you could just make sure you're using Capistrano 2 in your Gemfile for a quick fix.
gem 'capistrano', '2.15.5'
But if you're interested in using Capistrano 3, here is a pretty good upgrade guide that worked for me.

Answer 2

Looks like you are using Capistrano 2 syntax in your Capfile, and you have upgraded to the Capistrano 3 gem.
Capistrano 3 looks more like the following in the Capfile
require 'capistrano/rails'