[Newbie]: $buffer troubles

Hi all. I'm a newbie at GUI programming so, forgive me if the question has an obvious answer :)

When i try to run something like this

my $view = Gtk2::TextView->new();
$menu_new->signal_connect('activate', \&new, $view);
sub new {
        my $view = $_[1];
        my $local_buff = $view->get_buffer();
        my $start_iter;
        my $end_iter;

I obtain this runtime error message:

*** unhandled exception in callback:
***   Usage: get_start_iter(buffer) at ./main.pl line 128.
***  ignoring at ./main.pl line 109.

Can anyone tell me where's my error?
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