PhpPgAdmin redirect to default site or display Not Found

[lacsyst]

Hi

I have installed PhpPgAdmin and can't access to it, it's redirected to default web site or display this nessage

Not Found
The requested URL /phppgadmin/ was not found on this server.

.

I have also PhpMyAdmin installed and no problem with it.

I think it's something like VirtualHost problem but I don't where to search.

I need your help