app.psgi

#!/usr/bin/perl

use Tatsumaki::Application;
use strict;
use warnings;

Tatsumaki::Application->new([
    '/' => 'Controller::Main',
]);

__END__

Main.pm

#!/usr/bin/perl

use parent qw/Tatsumaki::Handler/;
use strict;
use warnings;

sub get {
    my $self = shift;
    $self->write('It is Main Controller.');
}

1;

Error msg:

Can't locate object method "new" via package "Controller::Main" (perhaps you forgot to load "Controller::Main"?) at /usr/local/share/perl/5.10.1/Tatsumaki/Application.pm line 55, <> line 11.