NameError: undefined local variable or method `article' for main:Object

[AaronStack]

hi, I am quiet new to ruby. I created a table article, I created a new row, but when I tried populating any of the fields e,g article.title = "my first" . the following error pops up, I am using cloud 9 ide
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/console.rb:110:in start' from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/console.rb:9:instart'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:68:in console' from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:inrun_command!'
from /usr/local/rvm/gems/ruby-2.3.0/gems/railties-4.2.5/lib/rails/commands.rb:17:in <top (required)>' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:inrequire'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:in block in require' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:240:inload_dependency'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:274:in require' from /home/ubuntu/workspace/bin/rails:9:in<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:268:in load' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:268:inblock in load'
from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:240:in load_dependency' from /usr/local/rvm/gems/ruby-2.3.0/gems/activesupport-4.2.5/lib/active_support/dependencies.rb:268:inload'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/commands/rails.rb:6:in call' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/command_wrapper.rb:38:incall'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application.rb:185:in block in serve' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application.rb:156:infork'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application.rb:156:in serve' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application.rb:131:inblock in run'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application.rb:125:in loop' from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application.rb:125:inrun'
from /usr/local/rvm/gems/ruby-2.3.0/gems/spring-1.6.4/lib/spring/application/boot.rb:18:in <top (required)>' from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
from /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
I have been stucked here for long, Please help.