Problems with Rails 4 app into Bluehost <p>I'm facing some problems launching my rails app hosted on bluehost. </p> <p>I think that the problem is the passenger version interacting with the rails 4 app but I'm not sure.</p> <p>When I launch my app I get this trace: </p> <pre><code>Ruby (Rack) application could not be started These are the possible causes: There may be a syntax error in the application's code. Please check for such errors and fix them. A required library may not installed. Please install all libraries that this application requires. The application may not be properly configured. Please check whether all configuration files are written correctly, fix any incorrect configurations, and restart this application. A service that the application relies on (such as the database server or the Ferret search engine server) may not have been started. Please start that service. Further information about the error may have been written to the application's log file. Please check it in order to analyse the problem. Error message: Could not initialize MySQL client library Exception class: RuntimeError Application root: /home5/barracam/rails_apps/admin/admin Backtrace: # File Line Location 0 /home5/barracam/ruby/gems/gems/mysql2-0.3.18/lib/mysql2.rb 31 in `require' 1 /home5/barracam/ruby/gems/gems/mysql2-0.3.18/lib/mysql2.rb 31 in `' 2 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler/runtime.rb 72 in `require' 3 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler/runtime.rb 72 in `block (2 levels) in require' 4 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler/runtime.rb 70 in `each' 5 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler/runtime.rb 70 in `block in require' 6 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler/runtime.rb 59 in `each' 7 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler/runtime.rb 59 in `require' 8 /usr/lib64/ruby/gems/1.9.3/gems/bundler-1.3.5/lib/bundler.rb 132 in `require' 9 /home5/barracam/rails_apps/admin/admin/config/application.rb 7 in `' 10 /home5/barracam/rails_apps/admin/admin/config/environment.rb 2 in `require' 11 /home5/barracam/rails_apps/admin/admin/config/environment.rb 2 in `' 12 config.ru 3 in `require' 13 config.ru 3 in `block in' 14 /home5/barracam/ruby/gems/gems/rack-1.5.2/lib/rack/builder.rb 55 in `instance_eval' 15 /home5/barracam/ruby/gems/gems/rack-1.5.2/lib/rack/builder.rb 55 in `initialize' 16 config.ru 1 in `new' 17 config.ru 1 in `' 18 /etc/httpd/modules/passenger/lib/phusion_passenger/rack/application_spawner.rb 225 in `eval' 19 /etc/httpd/modules/passenger/lib/phusion_passenger/rack/application_spawner.rb 225 in `load_rack_app' 20 /etc/httpd/modules/passenger/lib/phusion_passenger/rack/application_spawner.rb 157 in `block in initialize_server' 21 /etc/httpd/modules/passenger/lib/phusion_passenger/utils.rb 563 in `report_app_init_status' 22 /etc/httpd/modules/passenger/lib/phusion_passenger/rack/application_spawner.rb 154 in `initialize_server' 23 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server.rb 204 in `start_synchronously' 24 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server.rb 180 in `start' 25 /etc/httpd/modules/passenger/lib/phusion_passenger/rack/application_spawner.rb 129 in `start' 26 /etc/httpd/modules/passenger/lib/phusion_passenger/spawn_manager.rb 253 in `block (2 levels) in spawn_rack_application' 27 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server_collection.rb 132 in `lookup_or_add' 28 /etc/httpd/modules/passenger/lib/phusion_passenger/spawn_manager.rb 246 in `block in spawn_rack_application' 29 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server_collection.rb 82 in `block in synchronize' 30 prelude&gt; 10:in `synchronize' 31 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize' 32 /etc/httpd/modules/passenger/lib/phusion_passenger/spawn_manager.rb 244 in `spawn_rack_application' 33 /etc/httpd/modules/passenger/lib/phusion_passenger/spawn_manager.rb 137 in `spawn_application' 34 /etc/httpd/modules/passenger/lib/phusion_passenger/spawn_manager.rb 275 in `handle_spawn_application' 35 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server.rb 357 in `server_main_loop' 36 /etc/httpd/modules/passenger/lib/phusion_passenger/abstract_server.rb 206 in `start_synchronously' 37 /etc/httpd/modules/passenger/helper-scripts/passenger-spawn-server 99 in `' Powered by Phusion Passenger, mod_rails / mod_rack for Apache and Nginx. </code></pre> <p>I tried to run a rails 3 app and all works fine. What do you think about the problem?</p> <p>Any help is really appreciated. </p>