PostgreSQL Connection Problem

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I am trying to use libgnomedbmm to connect to a PostgreSQL database.
I am using a global ODBC connection with the DSN=playback.
When I compile, I get no errors.
However, when I run the program, I get this error message:
  Data source playback not found in configuration

I based the code off of the "simple example" in the "Programming with 
libgnomedbmm" book.

Here is the code through the connect statement:

#include <iostream>
#include <libgnomedbmm.h>
#include <gtkmm.h>

int main(int argc, char* argv[])
{
       Gtk::Main kit(argc, argv);
       Gnome::Db::init("playback", "1.0", argc, argv);

       Glib::RefPtr<Gnome::Gda::Client> client = 
Gnome::Gda::Client::create();

       Glib::RefPtr<Gnome::Gda::DataModel> model;

       // Create a connection to an example SQLite database. The 
function might
       // fail, so we have to catch potential exceptions.
#ifdef GLIBMM_EXCEPTIONS_ENABLED
       try
       {
               // Glib::RefPtr<Gnome::Gda::Connection> connection = 
client->open_connection_from_string(\
               // "SQLite", "DB_DIR=" LIBGNOMEDB_DATADIR 
";DB_NAME=demo_db", "" /* username */, "" /* password */);
               // Use PostgreSQL through ODBC instead . . .            
               // 
"ODBC;DRIVER={PostgreSQL};DATABASE=playback;SERVER=localhost;PORT=5432;Uid=joe;Pwd=\0;"
               Glib::RefPtr<Gnome::Gda::Connection> connection = 
client->open_connection("playback","","");

               model = connection->execute_select_command("SELECT * 
FROM game");
       }
       catch(const Glib::Error& e)
       {
               std::cerr << e.what() << std::endl;
               return 1;
       }
#else
// END OF THE PART THAT I HAVE CHANGED


QUESTION: What do I have wrong and how do I fix it?