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To prevent `ArgumentError`, `config.action_view.sanitized_allowed_attributes` should be assigned by an array instead of a list.
```
/Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/set.rb:98:in `do_with_enum': value must be enumerable (ArgumentError)
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/set.rb:355:in `merge'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/actionview-4.1.1/lib/action_view/helpers/sanitize_helper.rb:211:in `sanitized_allowed_attributes='
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/actionview-4.1.1/lib/action_view/railtie.rb:26:in `block (3 levels) in <class:Railtie>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/actionview-4.1.1/lib/action_view/railtie.rb:25:in `each'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/actionview-4.1.1/lib/action_view/railtie.rb:25:in `block (2 levels) in <class:Railtie>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/lazy_load_hooks.rb:27:in `each'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/activesupport-4.1.1/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/actionview-4.1.1/lib/action_view/railtie.rb:24:in `block in <class:Railtie>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:30:in `run'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `call'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
from /Users/tonytonyjan/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/application.rb:288:in `initialize!'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/config/environment.rb:5:in `<top (required)>'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/config.ru:3:in `require'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/config.ru:3:in `block in <main>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/config.ru:in `new'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/config.ru:in `<main>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/builder.rb:49:in `eval'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/builder.rb:49:in `new_from_string'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/builder.rb:40:in `parse_file'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/server.rb:199:in `app'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/server.rb:50:in `app'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/server.rb:130:in `log_to_stdout'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/server.rb:67:in `start'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:81:in `block in server'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:76:in `tap'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:76:in `server'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/railties-4.1.1/lib/rails/commands.rb:17:in `<top (required)>'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/bin/rails:8:in `require'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/bin/rails:8:in `<top (required)>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/lib/spring/client/rails.rb:27:in `load'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/lib/spring/client/rails.rb:27:in `call'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/lib/spring/client/command.rb:7:in `call'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/lib/spring/client.rb:26:in `run'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/bin/spring:48:in `<top (required)>'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `load'
from /Users/tonytonyjan/.rvm/gems/ruby-2.1.2/gems/spring-1.1.3/lib/spring/binstub.rb:11:in `<top (required)>'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/bin/spring:16:in `require'
from /Users/tonytonyjan/Dropbox/home/codes/penta_ruby/bin/spring:16:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
```
|
