[Bioperl-l] Bio::Root::IO possible bug?

[Vamsi]

Hi,

After I upgraded to Bioperl 1.2.3 having problems with even
simple scripts.

For instance

--------------
use Bio::SeqIO;
my $in = Bio::SeqIO->new(-file => $ARGV[0], -format => 'Fasta');
$in->next_seq;
$in->close;
--------------

results in

Can't call method "isa" on unblessed reference at /usr/perl5/site_perl/5.005/Bio/Root/IO.pm line 487, <GEN0> chunk 1.

Is there a bug in Bio::Root::IO.pm?

Thanks,
Vamsi