site running ok on localhost but error on Heroku

Question

I dont understand what is going on here.

I built my website with ruby on rails on postgresql database.

And it runs perfectly find on the local server.

But I just deployed it to Heroku and I am receiving this error;

FYI, I created a procfile as suggested on Heroku's website.

Application Error

An error occurred in the application and your page could not be served. Please try again in a few moments.

If you are the application owner, check your logs for details.

   2013-06-26T03:02:07.421697+00:00 app[web.1]:     from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    2013-06-26T03:02:07.421506+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
    2013-06-26T03:02:07.421506+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
    2013-06-26T03:02:07.421697+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    2013-06-26T03:02:07.421506+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
    2013-06-26T03:02:07.421506+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
    2013-06-26T03:02:07.421697+00:00 app[web.1]:    from script/rails:6:in `require'
    2013-06-26T03:02:07.421697+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    2013-06-26T03:02:07.421697+00:00 app[web.1]:    from script/rails:6:in `<main>'
    2013-06-26T03:02:07.421697+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
    2013-06-26T03:02:07.439117+00:00 app[web.1]: Exiting
    2013-06-26T03:02:07.421506+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
    2013-06-26T03:02:07.421697+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
    2013-06-26T03:02:08.750717+00:00 heroku[web.1]: Process exited with status 1
    2013-06-26T03:02:08.745131+00:00 heroku[web.1]: State changed from starting to crashed
    2013-06-26T03:12:15.338756+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 47851 -e $RACK_ENV`
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
    2013-06-26T03:12:21.836349+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (LoadError)
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from script/rails:6:in `require'
    2013-06-26T03:12:21.836349+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    2013-06-26T03:12:21.836547+00:00 app[web.1]:    from script/rails:6:in `<main>'
    2013-06-26T03:12:21.865436+00:00 app[web.1]: Exiting
    2013-06-26T03:12:23.663577+00:00 heroku[web.1]: Process exited with status 1
    2013-06-26T03:12:23.677322+00:00 heroku[web.1]: State changed from starting to crashed
    2013-06-26T03:22:43.460462+00:00 heroku[web.1]: State changed from crashed to starting
    2013-06-26T03:22:48.976685+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 30463 -e $RACK_ENV`
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
    2013-06-26T03:22:54.590985+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (LoadError)
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from script/rails:6:in `<main>'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
    2013-06-26T03:22:54.590985+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
    2013-06-26T03:22:54.591157+00:00 app[web.1]:    from script/rails:6:in `require'
    2013-06-26T03:22:54.621142+00:00 app[web.1]: Exiting
    2013-06-26T03:22:55.841091+00:00 heroku[web.1]: Process exited with status 1
    2013-06-26T03:22:55.859629+00:00 heroku[web.1]: State changed from starting to crashed
    2013-06-26T03:32:48.892316+00:00 heroku[web.1]: State changed from crashed to starting
    2013-06-26T03:32:52.032180+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 58591 -e $RACK_ENV`
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
    2013-06-26T03:32:54.409527+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (Load
    Error)
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
    2013-06-26T03:32:54.409527+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
    2013-06-26T03:32:54.426193+00:00 app[web.1]: Exiting
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from script/rails:6:in `require'
    2013-06-26T03:32:54.409728+00:00 app[web.1]:    from script/rails:6:in `<main>'
    2013-06-26T03:32:55.409933+00:00 heroku[web.1]: Process exited with status 1
    2013-06-26T03:32:55.424202+00:00 heroku[web.1]: State changed from starting to crashed
    2013-06-26T03:42:57.889181+00:00 heroku[web.1]: State changed from crashed to starting
    2013-06-26T03:43:02.239973+00:00 heroku[web.1]: Starting process with command `bundle exec rails server thin -p 56589 -e $RACK_ENV`
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:236:in `load_dependency'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler/thin.rb:1:in `<top (required)>'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `const_get'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `block in get'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `each'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `inject'
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/handler.rb:20:in `get'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/rack-1.4.5/lib/rack/server.rb:272:in `server'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands/server.rb:59:in `start'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from script/rails:6:in `require'
    2013-06-26T03:43:05.359889+00:00 app[web.1]:    from script/rails:6:in `<main>'
    2013-06-26T03:43:05.378536+00:00 app[web.1]: Exiting
    2013-06-26T03:43:06.587742+00:00 heroku[web.1]: Process exited with status 1
    2013-06-26T03:43:05.359693+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- thin (LoadError)
    2013-06-26T03:43:05.359693+00:00 app[web.1]:    from /app/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.13/lib/active_support/dependencies.rb:251:in `block in require'

Answer 1

in your Gemfile add ruby '1.9.3'

Heroku is providing ruby 2.0 as default, so if you dont specify ruby version, then heroku will try to run ruby2.0 for your app, and it will cause error.

Answer 2

Try running heroku logs -n 200 to print out more lines from the log - sometimes the actual errors are moved off screen due to truncated logs.

Answer 3

do you have gem thin in your Gemfile?

The error is telling you that can't found thin