PG gem errors on attempting to make connection

I have installed Postgres 8.4.4 via MacPorts per a RobbyOnRails installation guide. When I attempt to connect to a project I get the following error:

establish_connection':RuntimeError: Please install the postgresql adapter: `gem install activerecord-postgresql-adapter` (dlopen(/Library/Ruby/Gems/1.8/gems/pg-0.9.0/lib/pg_ext.bundle, 9): no suitable image found开发者_开发问答.  Did find:
    /Library/Ruby/Gems/1.8/gems/pg-0.9.0/lib/pg_ext.bundle: mach-o, but wrong architecture - /Library/Ruby/Gems/1.8/gems/pg-0.9.0/lib/pg_ext.bundle)

The PG gem successfully installs, but the above error is generated.

Any thoughts?

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The issue was that the PG gem was not being uninstalled from all locations. Once I forced the uninstall paths, everything seemed to work.