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...database: rails_test username: postgres password: myPassword development: adapter: ruby-postgres database: rails_development username: postgres password: myPassword When I created my rails app, I put a flag -d postgresql I have installed different database adapters (ruby-postgres, activerecord-jdbcpostgresql-adapter, postgres-pr). I''ve tried writing adapter: postgresql in the .yml file. But when I try to run the server (ruby script/server), I get the following error msg: G:/program files/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.1/lib/active_recor d/connection_adapters/abs...