Perl Message::Stack example - perl

Question

I am using Perl to try to implement an example for the Message::Stack module from CPAN.
I get the error
Can't locate object method "new" via package "Message::Stack" at stack.pl line 3.
my $stack = Message::Stack->new;
$stack->add(Message::Stack::Message->new(
msgid => 'something_happened',
level => 'error',
scope => 'login_formm',
subject => 'username',
text => 'Something happened!'
));
# Or... for those that want to type less
$stack->add({
msgid => 'something_else_happened',
level => 'error',
scope => 'login_form',
subject => 'password',
text => 'Something else happened!'
});
# ...
my $errors = $stack->for_level('error');
# Or
my $login_form_errors = $stack->for_scope('login_form');
$login_form_errors->for_subject('username');
print "Username has ".$login_form_errors->count." errors.\n";
Please let me know which object I need to load.

Answer 1

I am sure that what the message actually says is
Can't locate object method "new" via package "Message::Stack" (perhaps you forgot to load "Message::Stack"?) at stack.pl line 5.
So, did you forget?
And later, when you actually try to load it using
use Message::Stack
and it tells you
Can't locate Message/Stack.pm in #INC
doesn't it occur to you that it's not found because it isn't there, and needs installing?