While running the server in rails with ubuntu os am getting the following error in my local machine?

Question

=> Booting WEBrick => Rails 4.0.0 application starting in development on http://0.0.0.0:3000 => Run rails server -h for more startup options => Ctrl-C to shutdown server Exiting /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:245:in mkdir': File exists - /home/rank/rails/chethan/specslot/tmp/pids (Errno::EEXIST) from /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:245:infu_mkdir' from /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:219:in block (2 levels) in mkdir_p' from /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:217:inreverse_each' from /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:217:in block in mkdir_p' from /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:203:ineach' from /home/rank/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/fileutils.rb:203:in mkdir_p' from /home/rank/.rvm/gems/ruby-2.0.0-p643/gems/railties-4.0.0/lib/rails/commands/server.rb:71:inblock in start' from /home/rank/.rvm/gems/ruby-2.0.0-p643/gems/railties-4.0.0/lib/rails/commands/server.rb:70:in each' from /home/rank/.rvm/gems/ruby-2.0.0-p643/gems/railties-4.0.0/lib/rails/commands/server.rb:70:instart' from /home/rank/.rvm/gems/ruby-2.0.0-p643/gems/railties-4.0.0/lib/rails/commands.rb:78:in block in <top (required)>' from /home/rank/.rvm/gems/ruby-2.0.0-p643/gems/railties-4.0.0/lib/rails/commands.rb:73:intap' from /home/rank/.rvm/gems/ruby-2.0.0-p643/gems/railties-4.0.0/lib/rails/commands.rb:73:in <top (required)>' from bin/rails:4:inrequire' from bin/rails:4:in `'

Answer 1

Looks like there's another copy of rails server running.

Answer 2

remove /home/rank/rails/chethan/specslot/tmp/pids and try to start server again. Looks like you had emergency shut down your machine recently