Capistrano: Don't know how to build task 'deploy:new_release_path' - ruby-on-rails

Question

I am deploying for the first time to a Digital Ocean Ubuntu droplet. I have configured everything and followed all the steps and am now on the step where I issue the command: cap production deploy:initial. For this command I am getting back this error message:
cap aborted!
Don't know how to build task 'deploy:new_release_path' (see --tasks)
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/task_manager.rb:58:in `[]'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:361:in `[]'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/capistrano-3.7.1/lib/capistrano/dsl/task_enhancements.rb:12:in `after'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/capistrano-3.7.1/lib/capistrano/scm/git.rb:21:in `register_hooks'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/capistrano-3.7.1/lib/capistrano/configuration/plugin_installer.rb:28:in `install'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/capistrano-3.7.1/lib/capistrano/configuration.rb:155:in `install_plugin'
/Users/Christopher/ClientProjects/PawBookings/Capfile:3:in `<top (required)>'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/rake_module.rb:28:in `load'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/rake_module.rb:28:in `load_rakefile'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:687:in `raw_load_rakefile'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:96:in `block in load_rakefile'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:95:in `load_rakefile'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:79:in `block in run'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:77:in `run'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/capistrano-3.7.1/lib/capistrano/application.rb:14:in `run'
/Users/Christopher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/capistrano-3.7.1/bin/cap:3:in `<top (required)>'
/Users/Christopher/.rbenv/versions/2.3.1/bin/cap:22:in `load'
/Users/Christopher/.rbenv/versions/2.3.1/bin/cap:22:in `<main>'
Capfile
# Load DSL and Setup Up Stages
require 'capistrano/scm/git'
install_plugin Capistrano::SCM::Git
require 'capistrano/setup'
require 'capistrano/deploy'
require 'capistrano/rails'
require 'capistrano/bundler'
require 'capistrano/rvm'
require 'capistrano/puma'
# Loads custom tasks from `lib/capistrano/tasks' if you have any defined.
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }
config/deploy.rb
# Change these
server '12.34.56.789', port: 80, roles: [:web, :app, :db], primary: true
set :repo_url, 'my_ssh_github_url'
set :application, 'app_name'
set :user, 'deploy_username'
set :puma_threads, [4, 16]
set :puma_workers, 0
# Don't change these unless you know what you're doing
set :pty, true
set :use_sudo, false
set :stage, :production
set :deploy_via, :remote_cache
set :deploy_to, "/home/#{fetch(:user)}/apps/#{fetch(:application)}"
set :puma_bind, "unix://#{shared_path}/tmp/sockets/#{fetch(:application)}-puma.sock"
set :puma_state, "#{shared_path}/tmp/pids/puma.state"
set :puma_pid, "#{shared_path}/tmp/pids/puma.pid"
set :puma_access_log, "#{release_path}/log/puma.error.log"
set :puma_error_log, "#{release_path}/log/puma.access.log"
set :ssh_options, { forward_agent: true, user: fetch(:user), keys: %w(~/.ssh/id_rsa.pub) }
set :puma_preload_app, true
set :puma_worker_timeout, nil
set :puma_init_active_record, true # Change to false when not using ActiveRecord
## Defaults:
# set :scm, :git
# set :branch, :master
# set :format, :pretty
# set :log_level, :debug
# set :keep_releases, 5
## Linked Files & Directories (Default None):
# set :linked_files, %w{config/database.yml}
# set :linked_dirs, %w{bin log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}
namespace :puma do
desc 'Create Directories for Puma Pids and Socket'
task :make_dirs do
on roles(:app) do
execute "mkdir #{shared_path}/tmp/sockets -p"
execute "mkdir #{shared_path}/tmp/pids -p"
end
end
before :start, :make_dirs
end
namespace :deploy do
desc "Make sure local git is in sync with remote."
task :check_revision do
on roles(:app) 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
end
desc 'Initial Deploy'
task :initial do
on roles(:app) do
before 'deploy:restart', 'puma:start'
invoke 'deploy'
end
end
desc 'Restart application'
task :restart do
on roles(:app), in: :sequence, wait: 5 do
invoke 'puma:restart'
end
end
before :starting, :check_revision
after :finishing, :compile_assets
after :finishing, :cleanup
after :finishing, :restart
end
# ps aux | grep puma # Get puma pid
# kill -s SIGUSR2 pid # Restart puma
# kill -s SIGTERM pid # Stop puma
config/nginx.conf
upstream puma {
server unix:///home/deploy_username/apps/app_name/shared/tmp/sockets/app_name-puma.sock;
}
server {
listen 80 default_server deferred;
# server_name example.com;
root /home/deploy_username/apps/app_name/current/public;
access_log /home/deploy_username/apps/app_name/current/log/nginx.access.log;
error_log /home/deploy_username/apps/app_name/current/log/nginx.error.log info;
location ^~ /assets/ {
gzip_static on;
expires max;
add_header Cache-Control public;
}
try_files $uri/index.html $uri #puma;
location #puma {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_redirect off;
proxy_pass http://puma;
}
error_page 500 502 503 504 /500.html;
client_max_body_size 10M;
keepalive_timeout 10;
}
Update:
I moved a couple lines of code in the Capfile. The process seems to have started but now gives the following error message:
** Invoke production (first_time)
** Execute production
** Invoke load:defaults (first_time)
** Execute load:defaults
** Invoke bundler:map_bins (first_time)
** Execute bundler:map_bins
** Invoke deploy:set_rails_env (first_time)
** Execute deploy:set_rails_env
** Invoke deploy:set_linked_dirs (first_time)
** Execute deploy:set_linked_dirs
** Invoke deploy:set_rails_env
** Invoke rvm:hook (first_time)
** Execute rvm:hook
cap aborted!
Net::SSH::Disconnect: connection closed by remote host
New Capfile
# Load DSL and Setup Up Stages
require 'capistrano/setup'
require 'capistrano/deploy'
require 'capistrano/rails'
require 'capistrano/bundler'
require 'capistrano/rvm'
require 'capistrano/puma'
require 'capistrano/scm/git'
install_plugin Capistrano::SCM::Git
# Loads custom tasks from `lib/capistrano/tasks' if you have any defined.
Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }

Answer 1

The Git plugin relies on the deploy tasks being present. In your Capfile, you must install the Git plugin after requiring capistrano/deploy, like this:
require "capistrano/deploy"
require "capistrano/scm/git"
install_plugin Capistrano::SCM::Git

Answer 2

its mainly due to the ruby,rails and ubuntu updated version issues. I got the same problem.
Added in Capfile the below line before the last line and that solved my issue.
install_plugin Capistrano::Puma::Daemon
For reference follow the below tutorial. Would be helpful for someone. Because I spent lot of time to find a solution for this. https://matthewhoelter.com/2020/11/10/deploying-ruby-on-rails-for-ubuntu-2004.html