Just to give more info...

that's the message error:

Backend ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Wed Apr  4 10:23:11 2012

 Message: Need TicketID!

 Traceback (7019): 
   Module: Kernel::System::Ticket::Article::ArticleSend (v1.274.2.2) Line: 1999
   Module: Kernel::Modules::AgentTicketEmail::Run (v1.31) Line: 1065
   Module: Kernel::System::Web::InterfaceAgent::Run (v1.58.2.1) Line: 853
   Module: /opt/otrs/bin/cgi-bin/index.pl (v1.89.2.1) Line: 46

if I selecet a service it creates the ticket, if I don´t gives me this error...

any ideas?

Thanks