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I was up late working on a project and I kept running into this error after I tried to deploy to my staging server. It turns out you can’t use tabs in a YAML file. Oops..after I removed the tabs and used spaces my app started successfully.
/usr/lib64/ruby/1.8/yaml.rb:133:in `load': syntax error on line 18, col 3: ` adapter: mysql' (ArgumentError) from /usr/lib64/ruby/1.8/yaml.rb:133:in `load' from /usr/lib64/ruby/gems/1.8/gems/rails-2.1.2/lib/initializer.rb:716:in `database_configuration' from /usr/lib64/ruby/gems/1.8/gems/rails-2.1.2/lib/initializer.rb:340:in `initialize_database' from /usr/lib64/ruby/gems/1.8/gems/rails-2.1.2/lib/initializer.rb:124:in `process' from /usr/lib64/ruby/gems/1.8/gems/rails-2.1.2/lib/initializer.rb:97:in `send' from /usr/lib64/ruby/gems/1.8/gems/rails-2.1.2/lib/initializer.rb:97:in `run'
