[perl+lighttpd] Custom Include library issue

Hi all,

I'm new to this list, that's my first post.
I'm here to ask for help hoping it's the right place to get some hints.

I'm using fastcgi perl module with lighttpd, everything works fine when
not including custom files.

I show an example:

#!/usr/bin/perl -w

use warnings;
use strict;
use lib '/custom/folder/lib';
use MyCustomLib;

html_start('title','img/favicon.ico','css/style.css', $jsblob);


The first time I execute this code, the html_start() is undefined,
as the library was not included.
On the second attempt, reloading the page, it works just fine and do what it should.

My lighttpd configuration for perl is:

fastcgi.server += ( ".pl" =>
        ((
          "socket" => "/tmp/perl-fastcgi.socket",
          "bin-path" => var.docroot + "/perl_dispatcher.fcgi",
	  "check-local" => "disable",
          "min-procs" => 2,
          "max-procs" => 5,
          "idle-timeout"    => 20
         ))
)

content of perl_dispatcher.fcgi

#!/usr/bin/perl
use strict;
use warnings;
use CGI::Fast;
use Embed::Persistent;
{
    my $p = Embed::Persistent->new();
    while (new CGI::Fast) {
        my $filename = $ENV{SCRIPT_FILENAME};
        my $package = $p->valid_package_name($filename);
        my $mtime;
        if ($p->cached($filename, $package, \$mtime))
        {
            eval {$package->handler;};
        }
        else
 	{
            $p->eval_file($ENV{SCRIPT_FILENAME});
        }
    }
}

error log while executing the script:

2010-10-06 18:44:36: (mod_fastcgi.c.2979) got proc: pid: 6090 socket: unix:/tmp/perl-fastcgi.socket-3 load: 1 
2010-10-06 18:44:36: (mod_fastcgi.c.2610) FastCGI-stderr: Undefined subroutine &Embed::home::www::iwkse::docs_2epl::html_start called at (eval 34) line 14.
 at /home/www/perl_dispatcher.fcgi line 18
Undefined subroutine &Embed::home::www::iwkse::docs_2epl::html_start called at (eval 34) line 14.
 at /home/www/perl_dispatcher.fcgi line 18
 
2010-10-06 18:44:36: (mod_fastcgi.c.1508) released proc: pid: 6090 socket: unix:/tmp/perl-fastcgi.socket-3 load: 0 
2010-10-06 18:44:38: (mod_fastcgi.c.1761) connect failed: Connection refused on unix:/tmp/perl-fastcgi.socket-3 
2010-10-06 18:44:38: (mod_fastcgi.c.2930) backend died; we'll disable it for 5 seconds and send the request to another backend instead: reconnects: 0 load: 2 
2010-10-06 18:44:38: (mod_fastcgi.c.2726) --- fastcgi spawning 
        socket unix:/tmp/perl-fastcgi.socket-3 
        current: 1 / 5 
2010-10-06 18:44:38: (mod_fastcgi.c.794) new proc, socket: 0 /tmp/perl-fastcgi.socket-3 
2010-10-06 18:44:38: (mod_fastcgi.c.2979) got proc: pid: 6092 socket: unix:/tmp/perl-fastcgi.socket-3 load: 1 
cat: errore di scrittura: Pipe rotta
2010-10-06 18:44:38: (mod_fastcgi.c.1508) released proc: pid: 6092 socket: unix:/tmp/perl-fastcgi.socket-3 load: 0 
2010-10-06 18:44:41: (mod_fastcgi.c.2979) got proc: pid: 6092 socket:
unix:/tmp/perl-fastcgi.socket-3 load: 1 

Anyone has a clue about what it could be?
Right now the code works if just on one script but it's an ugly and redundant solution :\
Any help is really appreciated,

regards,
Salvatore