Dancer2::* panels show "..." text

[niceperl]

I have configured my Dancer2 application with Dancer::Debugger.
The app debugging panels are shown, but the Dancer2::* sections (Router, Logger, Session, ...) only display a "..." text without more valuable information.
Am I doing something wrong?

This is the app.psgi file:

#!/usr/bin/env perl

use strict;
use warnings;
use FindBin;
use lib "$FindBin::Bin/../lib";
use MyApp;

my $app = MyApp->to_app;

use Plack::Builder;
use Dancer2::Debugger;
my $debugger = Dancer2::Debugger->new;

builder {
    $debugger->mount;
    mount '/' => builder {
        $debugger->enable;
        $app;
    }
}