[Koha] Barcode's continued part three

When I tried to run barcode.pl use Modern::Perl; use Koha::Biblios; use Koha::Items; my $biblios = Koha::Biblios->search; my $branchcode='ppa'; while (my $biblio=$biblios->next) { Koha::Item->new( { biblionumber =>$biblio->biblionumber, homebranch =>$branchcode, holdingbranch =>$branchcode, barcode =>'barcode_'.$biblio->biblionumber, itype =>$biblio->biblioitem->itemtype, } )->store; } This is the error messages that I got: No method biblioitem! at barcode.pl line 8 Can't call method "itemtype" on an undefined value at barcode.pl line 10 Any help will be nice.