[Unattended-gui-developer] Help me!

[Gui ....c. <gui...@ho...>]

Hello,
I installed unattended correctly but I don’t understand how unattended-gui 
functions with it.
I used a tutorial « Getting started » but after ?
I think to modify install.pl, i look tutorial « install.pl » but I have an 
error.
“Can’t locate Socket.pm in @INC (@INC contains: z:\lib 
/dev/env/DJDIR/lib/perl5 …) at z:\dosbin\install.pl line 10
BEGIN failed –compilation aborted at z:\dosbin\install.pl line 10”

I’m on windows with unattended ‘s dosboot .
The djpgg’s file are installed in z:\djgpp.
Why I have an error?
Can you explain me the principle of operation of unattended-gui?