Need help with ActiveWarehouse-ETL-0.9.1 PG connection problem

I am trying to load conversion data into a postgresql database using activewarehouse-etl. I can create a flat file output from the conversion data without problem. However, when I try to load into the table using the information contained in config/database.yml I see this error:

/usr/lib64/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/ base.rb:1959:in `method_missing': undefined method `postgresql_connection' for #<Class:0x2ad8c8e90428> (NoMethodError)

Can anyone hazard a guess as to what this means, what might be causing it and how I might fix it? The only reference to `postgresql_connection' that I can find in AR-2.3.5 is this:

# activerecord-2.3.5/lib/active_record/connection_adapters/ postgresql_adapter.rb

module ActiveRecord   class Base     # Establishes a connection to the database that's used by all Active Record objects     def self.postgresql_connection(config) # :nodoc:       config = config.symbolize_keys       host = config[:host]       port = config[:port] || 5432       username = config[:username].to_s if config[:username]       password = config[:password].to_s if config[:password] . . .