upgrading debconf error

[Jaume Teixi]

Setting up debconf (0.4.02) ...
Can't locate object method "value" via package
"Debian::DebConf::Question" at /usr/lib/perl5/Debconf/Config.pm line 31.

dpkg: error processing debconf (--configure):


how can I proced with shuch error ?

thanks,
jaume.