System error

DBI connect('port=5432;host=mercurio;dbname=bmc2009','jmerelo',...) failed: could not connect to server: Connection refused
Is the server running on host "mercurio" and accepting
TCP/IP connections on port 5432?
 at /usr/lib/perl5/site_perl/5.8.8/Ima/DBI.pm line 328


Trace begun at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Exceptions.pm line 129
HTML::Mason::Exceptions::rethrow_exception('DBI connect(\'port=5432;host=mercurio;dbname=bmc2009\',\'jmerelo\',...) failed: could not connect to server: Connection refused^J^IIs the server running on host "mercurio" and accepting^J^ITCP/IP connections on port 5432?^J at /usr/lib/perl5/site_perl/5.8.8/Ima/DBI.pm line 328^J') called at /usr/lib/perl5/5.8.8/Carp.pm line 269
Carp::croak('DBI connect(\'port=5432;host=mercurio;dbname=bmc2009\',\'jmerelo\',...) failed: could not connect to server: Connection refused^J^IIs the server running on host "mercurio" and accepting^J^ITCP/IP connections on port 5432?^J') called at /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/DBI.pm line 652
DBI::__ANON__(undef, undef) called at /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/DBI.pm line 707
DBI::connect('DBI', 'dbi:Pg:port=5432;host=mercurio;dbname=bmc2009', 'jmerelo', '', 'HASH(0xbabbbdc8)') called at /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-multi/DBI.pm line 549
DBI::connect_cached('DBI', 'dbi:Pg:port=5432;host=mercurio;dbname=bmc2009', 'jmerelo', '', 'HASH(0xba6091a0)') called at /usr/lib/perl5/site_perl/5.8.8/Ima/DBI.pm line 328
Ima::DBI::__ANON__('Persona') called at /usr/lib/perl5/site_perl/5.8.8/Ima/DBI.pm line 393
Ima::DBI::__ANON__('Persona') called at /usr/lib/perl5/site_perl/5.8.8/Class/DBI.pm line 1135
Class::DBI::sth_to_objects('Persona', 'RetrieveAll') called at /usr/lib/perl5/site_perl/5.8.8/Class/DBI.pm line 1078
Class::DBI::retrieve_all('Persona') called at /home/jmerelo/public_html/jornadas/BMC6/ultimo.mc line 5
HTML::Mason::Commands::__ANON__ at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0xbabc1574)') called at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 1262
eval {...} at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 1252
HTML::Mason::Request::comp(undef, undef) called at /home/jmerelo/public_html/jornadas/BMC6/index.mhtml line 66
HTML::Mason::Commands::__ANON__ at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Component.pm line 135
HTML::Mason::Component::run('HTML::Mason::Component::FileBased=HASH(0xba568710)') called at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 1257
eval {...} at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 1252
HTML::Mason::Request::comp(undef, undef, undef) called at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 466
eval {...} at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 466
eval {...} at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/Request.pm line 418
HTML::Mason::Request::exec('HTML::Mason::Request::ApacheHandler=HASH(0xba560c10)') called at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/ApacheHandler.pm line 168
HTML::Mason::Request::ApacheHandler::exec('HTML::Mason::Request::ApacheHandler=HASH(0xba560c10)') called at /usr/lib/perl5/vendor_perl/5.8.8/HTML/Mason/ApacheHandler.pm line 826
HTML::Mason::ApacheHandler::handle_request('HTML::Mason::ApacheHandler=HASH(0xba4a304c)', 'Apache2::RequestRec=SCALAR(0xb9b282ec)') called at (eval 31) line 8
HTML::Mason::ApacheHandler::handler('HTML::Mason::ApacheHandler', 'Apache2::RequestRec=SCALAR(0xb9b282ec)') called at -e line 0
eval {...} at -e line 0