DBI frage

hallo

Ich bin gerade dabei einen Zeitschriften Artikel über Ruby/DBI zu schreiben
und jetzt über ein problem gestolpert.

habe Ruby 1.6.5 und ruby/dbi 0.14 unter RedHat 7.1.
datenbank: postgresql 7.1.3
hier mein beispiel skript:
(soll sämtliche daten zur tabelle "greifvögel" ausgeben wie z.B. spaltennamen)

require "dbi"

DBI.connect('dbi:Pg:voegel', 'markus', 'passwd') do | dbh |
dbh.columns("greifvoegel").each { |col|
    col.keys.each { |key|
        printf("%-15s: %-30s\n", key, col[key])
    }
    puts 
}
end

das programm tut zwar genau was ich will aber gibt auch eine fehlermeldung 
aus:
hier der output:

/home/markus/writings/ruby-dbi$  ./meta.rb
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:554: warning: instance variable 
@trace_mode not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:554: warning: instance variable 
@trace_output not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:459: warning: instance variable 
@trace_mode not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:460: warning: instance variable 
@trace_output not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:554: warning: instance variable 
@trace_mode not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:554: warning: instance variable 
@trace_output not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:459: warning: instance variable 
@trace_mode not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:460: warning: instance variable 
@trace_output not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:554: warning: instance variable 
@trace_mode not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:554: warning: instance variable 
@trace_output not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:459: warning: instance variable 
@trace_mode not initialized
/usr/local/lib/ruby/site_ruby/1.6/dbi/dbi.rb:460: warning: instance variable 
@trace_output not initialized
precision      : 10
type_name      : character varying
name           : gefaehrdet
scale          :
sql_type       : 12
nullable       : true
primary        :
unique         :
indexed        : false
default        :

...................

weiß jemand was das problem ist??

markus

-- 
Markus Jais
http://www.mjais.de
[email protected]
The road goes ever on and on - Bilbo Baggins