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a 'AddPublisher' state was sent from poe at 13 to session 2, but sessi
+on 2 has neither that state nor a _default state to handle it

POE::Component::Server::TCP->new( Alias => 'TCPServer',
...
                  AddPublisher =>
                  $_[SESSION],
                  1 ); },

sub POE::Kernel::ASSERT_DEFAULT () { 1 }
use POE qw( Session
            Component::Server::TCP );
...
                                            1 ); },
                        _stop => sub {} } );
POE::Kernel->run;