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Home/ Questions/Q 7669371
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T15:34:45+00:00 2026-05-31T15:34:45+00:00

I am new to Rails & Ruby and have been following the http://ruby.railstutorial.org/ruby-on-rails-tutorial-book and

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I am new to Rails & Ruby and have been following the http://ruby.railstutorial.org/ruby-on-rails-tutorial-book and amy trying to deploy the demo app to my Dreamhost passenger enabled host and when I try to run the app if fails with:

Ruby (Rack) application could not be started

and the following backtrace (formatting the best I can):

#   File    Line    Location
0   /usr/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/setup.rb  10  in `exit'
1   /usr/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/setup.rb  10  
2   /usr/lib/ruby/1.8/rubygems/custom_require.rb    36  in `gem_original_require'
3   /usr/lib/ruby/1.8/rubygems/custom_require.rb    36  in `require'
4   /home/oilfieldx/oilfieldexchange.com/releases/20120108233024/config/boot.rb 6   
5   /usr/lib/ruby/1.8/rubygems/custom_require.rb    31  in `gem_original_require'
6   /usr/lib/ruby/1.8/rubygems/custom_require.rb    31  in `require'
7   /home/oilfieldx/oilfieldexchange.com/releases/20120108233024/config/application.rb      1   
8   /usr/lib/ruby/1.8/rubygems/custom_require.rb    31  in `gem_original_require'
9   /usr/lib/ruby/1.8/rubygems/custom_require.rb    31  in `require'
10  /home/oilfieldx/oilfieldexchange.com/releases/20120108233024/config/environment.rb  2   
11  /usr/lib/ruby/1.8/rubygems/custom_require.rb    31  in `gem_original_require'
12  /usr/lib/ruby/1.8/rubygems/custom_require.rb    31  in `require'
13  config.ru   3   
14  /usr/lib/ruby/gems/1.8/gems/rack-1.2.1/lib/rack/builder.rb  46  in `instance_eval'
15  /usr/lib/ruby/gems/1.8/gems/rack-1.2.1/lib/rack/builder.rb  46  in `initialize'
16  config.ru   1   in `new'
17  config.ru   1   

My environment.rb file has:

# Load the rails application
<br>require File.expand_path('../application', __FILE__)

# Initialize the rails application
<br>DemoApp::Application.initialize!

My app runs fine on my local machine but just craters once I deploy it. I am guessing I am missing a line in a config file or something to do with my gems from what I gather researching this.

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1 Answer

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  1. Editorial Team
    Editorial Team
    2026-05-31T15:34:47+00:00Added an answer on May 31, 2026 at 3:34 pm

    My answer ended up being Heroku :^)

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