PGInterval setMinutes unrecognize ???

Hi everybody,

Someone can tell me why I get that error :

     symbol  : method setMinutes(int)
     location: class org.postgresql.util.PGInterval
                 duree.setMinutes((int)minutes);
     1 error

when :

     PGInterval duree = new PGInterval();   // passed
     duree.setMinutes((int)minutes);           //buzzzzzzzzzzz
           


I can create new PGInterval but I can use its methods... can't understand and make me mad !

thx

andy