i write the flow at the client side

my $soap = SOAP::Lite->uri(
                  'Menu/SOAP')->proxy('<url>/a.cgi',
                  timeout => $timeout) ;
        my $response;
            $response = $soap->find_services($obj, $instance);
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at the server side a.cgi

use SOAP::Transport::HTTP;
use Menu::SOAP;

SOAP::Transport::HTTP::CGI
    -> dispatch_to('Menu::SOAP')
    -> handle;
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at Menu/SOAP.pm

sub find_services {
}
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I don't write the code of find_services as the program dies in the parsing beforehand.
I would be happy to give more information when needed