How read glade file to gtk2?

[Xiao Yafeng <xyf xiao gmail com>]

Hi,
       is there error in below code? it throw

Unhandled tag: 'requires' at test2.pl line 6.


use Gtk2 -init;



my $builder = Gtk2::Builder->new();
$builder->add_from_file("3.glade");
#$builder->connect_signals();
my $object = $builder->get_object("window1");
$object->show_all();
gtk_main();

Thanks.