Don't know how to build task 'unicorn:start' Capistrino 3

Versions: Ruby 2.2.2 Capistrano 3.4.0 Rake / Rails / etc rails 4.2.1 Platform: Working on....Ubuntu 15.04 Deploying to... Server Logs: http://ift.tt/1IGbbog Capfile: http://ift.tt/1cECl2B

deploy.rb: http://ift.tt/1IGbboj production.rb: http://ift.tt/1cECliT

Old deploy.rb: http://ift.tt/1IGbbEx

I tried to upgrade Capistrino from 2 to 3 but failed. I also need to convert the old deploy.rb properly.

Thanks