ruby on rails - Error Trying to use Rubber to deploy on EC2 -

i'm following railscast #347 (http://railscasts.com/episodes/347-rubber-and-amazon-ec2) deploying app on amazon ec2. following steps, when try execute command cap rubber:create_staging error showed me /users/juampi/.rvm/gems/ruby-2.2.1/gems/rubber-3.2.0/lib/rubber/cloud/aws/base.rb:75:inbefore_create_instance': undefined method instance_alias' #<rubber::configuration::instanceitem:0x007f9fce9704f8> (nomethoderror)

here entire output

cap rubber:create_staging     triggering load callbacks   * 2016-01-16 18:24:12 executing `rubber:init'   * 2016-01-16 18:24:13 executing `rubber:create_staging' hostname use staging instance [production]:  roles use staging instance [apache,app,collectd,common,db:primary=true,elasticsearch,examples,graphite_server,graphite_web,graylog_elasticsearch,graylog_mongodb,graylog_server,graylog_web,haproxy,mongodb,monit,passenger,postgresql,postgresql_master,web,web_tools]:    * 2016-01-16 18:24:15 executing `rubber:create' /users/juampi/.rvm/gems/ruby-2.2.1/gems/rubber-3.2.0/lib/rubber/cloud/aws/base.rb:75:in `before_create_instance': undefined method `instance_alias' #<rubber::configuration::instanceitem:0x007f9fce9704f8> (nomethoderror)     /users/juampi/.rvm/gems/ruby-2.2.1/gems/rubber-3.2.0/lib/rubber/thread_safe_proxy.rb:13:in `method_missing'     /users/juampi/.rvm/gems/ruby-2.2.1/gems/rubber-3.2.0/lib/rubber/recipes/rubber/instances.rb:281:in `block in create_instance'     /users/juampi/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'     /users/juampi/.rvm/gems/ruby-2.2.1/gems/rubber-3.2.0/lib/rubber/recipes/rubber/instances.rb:280:in `create_instance'     /users/juampi/.rvm/gems/ruby-2.2.1/gems/rubber-3.2.0/lib/rubber/recipes/rubber/instances.rb:230:in `block (2 levels) in create_instances' 

this gemfile

source 'https://rubygems.org'   # bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.1.4' # use sqlite3 database active record group :development, :test     gem 'sqlite3' end group :production   gem 'pg' end gem 'pg_search' #gem 'pg', group: :production #gem 'sqlite3' # use scss stylesheets gem 'sass-rails', '~> 4.0.3' # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0' # use coffeescript .js.coffee assets , views gem 'coffee-rails', '~> 4.0.0' # see https://github.com/sstephenson/execjs#readme more supported runtimes # gem 'therubyracer',  platforms: :ruby gem 'acts_as_shopping_cart', '~> 0.2.1'  # use jquery javascript library gem 'jquery-rails' # turbolinks makes following links in web application faster. read more: https://github.com/rails/turbolinks #gem 'turbolinks' gem 'owlcarousel-rails'  # build json apis ease. read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates api under doc/api. gem 'sdoc', '~> 0.4.0',          group: :doc gem 'hirb' gem 'carrierwave' #gem 'bootstrap-sass', '~> 3.3.0' gem 'devise' gem 'rolify' gem 'cancan' gem 'will_paginate' gem 'will_paginate-bootstrap' #gem "twitter-bootstrap-rails" gem 'therubyracer', :platform => :ruby gem 'materialize-sass' gem 'rails_12factor', group: :production   gem 'puma' gem 'cloudinary' gem 'mercadopago'  group :development   gem 'capistrano', '~> 2.12' end #gem 'capistrano', '~> 2.12' #gem 'libv8', '3.11.8.0' # use activemodel has_secure_password # gem 'bcrypt', '~> 3.1.7' # use unicorn app server # gem 'unicorn'  # use capistrano deployment # gem 'capistrano-rails', group: :development  # use debugger # gem 'debugger', group: [:development, :test]  # windows not include zoneinfo files, bundle tzinfo-data gem gem 'tzinfo-data', platforms: [:mingw, :mswin] gem 'rubber', '~> 3.1' gem 'open4' gem 'gelf' gem 'graylog2_exceptions', :git => 'git://github.com/wr0ngway/graylog2_exceptions.git' gem 'graylog2-resque' 

and rubber.yml

# required: name of application app_name: iaw2015  # required: system user run app servers app_user: app  # required: notification emails (e.g. monit) sent address # admin_email: "root@#{full_host}"  # optional: if not set, won't able access web_tools # server (graphite, graylog, monit status, haproxy status, etc) # web_tools_user: admin # web_tools_password: sekret  # required: timezone server should in timezone: us/eastern  # required: domain instances should associated # domain: foo.com  # optional: see rubber-dns.yml dns configuration # lets rubber update dynamic dns service instance alias # , ip when created.  allows setting arbitrary # dns records (cname, mx, round robin dns, etc)  # optional: additional rubber file pull config if exists.  file # pushed remote host @ rubber.root/config/rubber/rubber-secret.yml # # rubber_secret: "#{file.expand_path('~') + '/.ec2' + (rubber.env == 'production' ? '' : '_dev') + '/rubber-secret.yml' rescue 'rubber-secret.yml'}"  # optional: encryption key used obfuscate contents of rubber-secret.yml "rubber util:obfuscation"  # not better when stored in here, use ruby snippet in here fetch key server or # # rubber_secret_key: "xxxyyy=="  # required known cloud providers settings needed configure them # there's 1 working cloud provider right - amazon web services # implement another, clone lib/rubber/cloud/aws.rb or make fog provider  # work in generic fashion # cloud_providers:   aws:     # required aws region want use.     #     # options include     # ap-northeast-1 # asia pacific (tokyo) region     # ap-southeast-1 # asia pacific (singapore) region     # ap-southeast-2 # asia pacific (sydney) region     # eu-west-1      # eu (ireland) region     # sa-east-1      # south america (sao paulo) region     # us-east-1      # east (northern virginia) region     # us-west-1      # west (northern california) region     # us-west-2      # west (oregon) region     #     region: us-east-1      # required amazon keys , account id (digits only, no dashes) used access aws api     #     access_key: #myaccesskey     secret_access_key: #mysecretaccesskey     account: #myaccount      # required:  name of amazon keypair , location of private key     #     # note: reason capistrano requires have both public ,     # private key in same folder, public key should have     # extension ".pub".  easiest way hand on create     # public key private key: ssh-keygen -y -f gsg-keypair > gsg-keypair.pub     #     key_name: gsg-keypair     key_file: "#{dir[(file.expand_path('~') rescue '/root') + '/.ec2/*' + cloud_providers.aws.key_name].first}"      # optional: needed bundling running instance using rubber:bundle     #     # pk_file: "#{dir[(file.expand_path('~') rescue '/root') + '/.ec2/pk-*'].first}"     # cert_file: "#{dir[(file.expand_path('~') rescue '/root') + '/.ec2/cert-*'].first}"     # image_bucket: "#{app_name}-images"      # optional: needed backing database s3     # backup_bucket: "#{app_name}-backups"      # optional: define vpc deploy to. alias can thought of     # unique rubber-specific id.  if vpc_alias , vpc_addr absent, rubber     # instead assume we're deploying ec2 classic     # vpc_alias: "#{app_name}_#{rubber.env == 'production' ? 'production' : 'development'}"     # vpc_cidr: 10.0.0.0/16      # vpcs typically have 2 subnets - 1 instances need     # direct internet connection (load balancers, etc.), , 1 instances     # don't (database servers, app servers, etc.).  @ least,     # we'll need public subnet.  rubber detect instance's private_nic     # configuration, , auto-create subnet if appropriate.  instances on     # public subnet need following configuration.      # important note aws vpc subnets availability zone-specific,     # meaning want specify availability zone     # instance.  have specify different subnet_cidr each     # availability zone, since subnets cannot overlap.     # private_nic:     #   subnet_cidr: '10.0.0.0/24'     #   gateway: public      # private subnet, need configure nat_gateway instance in     # public subnet machines can still reach outside world     # things software updates.  after configuring nat gateway, can     # set separate private subnet.  need set :gateway     # capistrano configuration value full hostname of nat gateway in     # order communicate instances on private subnets.  instances     # on private subnet need following configuration     #  private_nic:     #    subnet_cidr: '10.0.1.0/24'     #    gateway: "#{rubber_instances.for_role('nat_gateway').first.instance_id}"      # required: ami , instance type creating instances     # ubuntu images @ http://old.alestic.com/ work     # ubuntu 14.04.1 trusty instance-store 64-bit: ami-92f569fa     #     # m1.small or m1.large or m1.xlarge     image_type: t2.micro     image_id: ami-60b6c60a      # optional: provide fog-specific options directly.  should used if need special setting     # rubber not directly expose.  since these settings passed directly through fog, can't make     # guarantee how work (if fog renames attribute, e.g., config break).  please see fog     # source code option names.     # fog_options:       # ebs i/o optimized instance       # ebs-optimized instances deliver dedicated throughput between amazon ec2 , amazon ebs, options       # between 500 mbps , 1000 mbps depending on instance type used.       # read more , make sure image_type supports ebs_optimized function at: http://aws.amazon.com/ec2/instance-types/       # ebs_optimized: false      # optional: ec2 spot instance request support.     #     # enables creation of spot instance requests.  rubber wait synchronously until request fulfilled,     # @ point begin initializing instance, unless spot_instance_request_timeout set.     # spot_instance: true     #     # maximum price pay spot instance.     # spot_price: "0.085"     #     # if spot instance request can't fulfilled in 3 minutes, fallback on-demand instance creation.  if not set,     # default infinite.     # spot_instance_request_timeout: 180    digital_ocean:     # required: digital ocean region want use.     #     # options include     # new york 1     # amsterdam 1     # san francisco 1     # new york 2     # amsterdam 2     # singapore 1     #     # these change often.  check https://www.digitalocean.com/droplets/new date options.     # default new york 2 since region supports private networking     region: new york 2      # required: image name , type creating instances.     image_id: 14.04 x64     image_type: 512mb      # optionally enable private networking instances.     # supported in new york 2.     private_networking: true    # use alternate cloud provider supported fog.  doesn't work   # yet due differences in providers within fog, gives starting   # point contributing new provider rubber.  see rubber/lib/rubber/cloud(.rb)   fog:     credentials:       provider: rackspace       rackspace_api_key: 'xxx'       rackspace_username: 'yyy'     image_type: 123     image_id: 123  # required cloud provider use # cloud_provider: aws  # optional: store instance data. # # allowed forms are: # filesystem: "file:#{rubber.root}/config/rubber/instance-#{rubber.env}.yml" # cloud storage (s3): "storage:#{cloud_providers.aws.backup_bucket}/rubberinstances_#{app_name}/instance-#{rubber.env}.yml" # cloud table (simpledb): "table:rubberinstances_#{app_name}_#{rubber.env}" # # if need port between forms, load rails console then: # rubber.instances.save(location) # location 1 of allowed forms variable # # instance_storage: "file:#{rubber.root}/config/rubber/instance-#{rubber.env}.yml"  # optional: store backup of instance data # # useful when using remote store in case end # wiping single copy of instance data.  when using file # store, instance file typically under version control # project code, provides safety. # # instance_storage_backup: "storage:#{cloud_providers.aws.backup_bucket}/rubberinstances_#{app_name}/instance-#{rubber.env}-#{time.now.strftime('%y%m%d-%h%m%s')}.yml"  # optional: default ports security groups web_port: 80 web_ssl_port: 443 web_tools_port: 8080 web_tools_ssl_port: 8443  # optional: define security groups # each security group name associated sequence of maps # keys parameters ec2 authorizesecuritygroupingress api # source_security_group_name, source_security_group_owner_id # ip_protocol, from_port, to_port, cidr_ip # if want use source_group outside of project, add "external_group: true" # prevent group_isolation mangling name, e.g.  give access graphite # server other projects # # security_groups: #   graphite_server: #     description: graphite_server security group allow projects send graphite data #     rules: #       - source_group_name: yourappname_production_collectd #         source_group_account: 123456 #         external_group: true #         protocol: tcp #         from_port: "#{graphite_server_port}" #         to_port: "#{graphite_server_port}" # security_groups:   default:     description: default security group     rules:       - source_group_name: default         source_group_account: "#{cloud_providers.aws.account}"       - protocol: tcp         from_port: 22         to_port: 22         source_ips: [0.0.0.0/0]   web:     description: "to open port #{web_port}/#{web_ssl_port} http server on web role"     rules:       - protocol: tcp         from_port: "#{web_port}"         to_port: "#{web_port}"         source_ips: [0.0.0.0/0]       - protocol: tcp         from_port: "#{web_ssl_port}"         to_port: "#{web_ssl_port}"         source_ips: [0.0.0.0/0]   web_tools:     description: "to open port #{web_tools_port}/#{web_tools_ssl_port} internal/tools http server"     rules:       - protocol: tcp         from_port: "#{web_tools_port}"         to_port: "#{web_tools_port}"         source_ips: [0.0.0.0/0]       - protocol: tcp         from_port: "#{web_tools_ssl_port}"         to_port: "#{web_tools_ssl_port}"         source_ips: [0.0.0.0/0]  # optional: default security groups create instances assigned_security_groups: [default] roles:   web:     assigned_security_groups: [web]   web_tools:     assigned_security_groups: [web_tools]  # optional: automatically create security groups each host , role # ec2 classic doesn't allow 1 change groups instance belongs after # creation, it's have empty ones predefined.  ec2 vpc, however, # allow changing security groups after instance creation , allows far fewer # security groups per instance, shouldn't enable setting if using vpc. auto_security_groups: false  # optional: automatically isolate security groups each appname/environment # mangling names appname_env_groupname # makes safer have staging , production coexist on same ec2 # account, or multiple apps.  nb: due security group limits per instance # in ec2 vpcs, option should enabled if you're using ec2 classic. isolate_security_groups: false  # optional: prompts 1 sync security group rules when ones in amazon # differ in rubber prompt_for_security_group_sync: true  # optional: list of cidr address blocks represent private networks cluster. # set open wide access hosts in network.  consequently, setting cidr block # other private, unroutable block massive security hole. private_networks: [10.0.0.0/8]  # optional: packages install on instances # can install specific version of package using sub-array of pkg, version # example, packages: [[rake, 0.7.1], irb] packages: [postfix, build-essential, git-core, libxslt-dev, ntp]  # optional: package manager mirror use installation of primary packages (i.e., not explicitly # sourced different repository).  if not specified, whatever mirror configured server image # used. # # note ubuntu has special url can used auto-select mirror based upon geoip.  use # it, specify 'mirror://mirrors.ubuntu.com/mirrors.txt' value. # package_manager_mirror: 'mirror://mirrors.ubuntu.com/mirrors.txt'  # optional: command used identify particular os version.  used configurations # in rubber templates parameterized os version (e.g., package lists).  if not specified, ubuntu # assumed. os_version_cmd: 'lsb_release -sr'  # optional: gem sources setup rubygems # gemsources: ["https://rubygems.org"]  # optional: gems install on instances # can install specific version of gem using sub-array of gem, version # example, gem: [[rails, 4.2.1], bundler] gems: [bundler, [rubber, "#{rubber.version}"]]  # optional: string prepended shell command strings cause multi # statement shell commands fail fast.  may need comment out # on platforms, works me on linux/osx bash shell # stop_on_error_cmd: "function error_exit { exit 99; }; trap error_exit err"  # optional: default set of roles use when creating staging instance # "cap rubber:create_staging".  default uses known roles, # excluding slave roles, not desired staging, can # specify different set here # # staging_roles: "web,app,db:primary=true" # auto detect staging roles staging_roles: "#{known_roles.reject {|r| r =~ /slave/ || r =~ /^db$/ }.join(',')}"  # optional: lets 1 assign amazon elastic ips (static ips) instances #           should typically set on role/host level rather #           globally , unless want instances have #           static ip # # use_static_ip: true  # optional: specifies instance created in given availability zone #           availability zones sepcified amazon isolated #           each other hardware failures in 1 zone shouldn't #           affect instances in another.  such, specify these #           instances need redundant reduce chance of #           downtime. should typically set on role/host level #           rather globally.  use cap rubber:describe_zones see list #           of zones # availability_zone: us-east-1a  # optional: if want use elastic block store (ebs) persistent # volumes, add them host specific overrides , created # , assigned instance.  on initial creation, volume # attached _and_ formatted, if host disappears , recreate # it, volume remounted thereby preserving data # # hosts: #   my_host: #     availability_zone: us-east-1a #     volumes: #       - size: 100 # size of vol in gbs #         zone: us-east-1a # zone create volume in, needs match host's zone #         device: /dev/sdh # os device attach volume #         mount: /mnt/mysql # directory mount volume #         filesystem: ext4 # filesystem create on volume # #         # optional: provide fog-specific options directly.  should used if need special setting #         # rubber not directly expose.  since these settings passed directly through fog, can't make #         # guarantee how work (if fog renames attribute, e.g., config break).  please see fog #         # source code option names. #         fog_options: #           type: gp2 # type of volume, standard (ebs magnetic), io1 (provisioned iops - ssd), or gp2 (general purpose - ssd). #           iops: 500 # number of i/o operations per second (iops) volume supports. #                     # required when volume type io1; not used non-provisioned iops volumes. #       - size: 10 #         zone: us-east-1a #         device: /dev/sdi #         mount: /mnt/logs #         filesystem: ext4 #         fog_options: #           type: io1 #           iops: 500 # #       # volumes without mount/filesystem can used in raid arrays # #       - size: 50 #         zone: us-east-1a #         device: /dev/sdx #         fog_options: #           type: gp2 #           iops: 500 #       - size: 50 #         zone: us-east-1a #         device: /dev/sdy #         fog_options: #           type: gp2 #           iops: 500 # #    # use ephemeral volumes raid array #    local_volumes: #      - partition_device: /dev/sdb #        zero: false # zeros out disk improved performance #      - partition_device: /dev/sdc #        zero: false # zeros out disk improved performance # #     # raid array, you'll need add mdadm packages.  likewise, #     # xfsprogs needed xfs filesystem support #     # #     packages: [xfsprogs, mdadm] #     raid_volumes: #       - device: /dev/md0 # os device to create raid array on #         mount: /mnt/fast # directory mount array #         mount_opts: 'nobootwait' # recent ubuntu versions require flag or ssh not start on reboot #         filesystem: xfs # filesystem create on array #         filesystem_opts: -f # filesystem opts in mkfs #         raid_level: 0 # raid level use array #         # if you're using ubuntu 11.x or later (natty, oneiric, precise, etc) #         # want specify source devices in /dev/xvd format #         # see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/684875 #         # more information. #         # note: make change raid source_devices, not generic #         # volume commands above. #         source_devices: [/dev/sdx, /dev/sdy] # source ebs devices creating raid array (ubuntu lucid or older) #         source_devices: [/dev/xvdx, /dev/xvdy] # source ebs devices creating raid array (ubuntu natty or newer) # #     # lvm volumes, you'll need add lvm2 packages.  likewise, #     # xfsprogs needed xfs filesystem support #     packages: [xfsprogs, lvm2] #     lvm_volume_groups: #       - name: vg # volume group name #         physical_volumes: [/dev/sdx, /dev/sdy] # devices used lvm group (you can use one, can't stripe then) #         extent_size: 32 # size of volume extent in mb #         volumes: #           - name: lv # name of logical volume #             size: 999.9 # size of volume in gb (slightly less sum of physical volumes because lvm reserves space) #             stripes: 2 # count of stripes volume #             filesystem: xfs # filesystem create on logical volume #             filesystem_opts: -f # filesystem opts in mkfs #             mount: /mnt/large_work_dir # directory mount lvm volume  # optional: can define own variables here use when # transforming config files, , available in config # templates  <%%= rubber_env.var_name %> # # var_name: var_value  # variables can overridden on role, environment and/or host level creating # sub level config under roles, environments , hosts.  precedence host, environment, role # e.g. install mysql on db role, , awstats on web01:  # optional: role specific overrides # roles: #   somerole: #     packages: [] #   somerole2: #     myconfig: someval  # optional: environment specific overrides # environments: #   staging: #     myconfig: otherval #   production: #     myconfig: val  # optional: host specific overrides # hosts: #   somehost: #     packages: []