Uncaught TypeError: Cannot read property 'plugins' of undefined

[guardian2011]

All the other methods are working fine, but the foillowing code:

 document.addEventListener(window.tlantic.plugins.socket.receiveHookName, function (ev) {
   console.log(ev.metadata.host);    // host who sent the data
   console.log(ev.metadata.port);    // sender port
   console.log(ev.metadata.id);      // connection id
   console.log(ev.metadata.data);    // received data
 });

returns:

 Uncaught TypeError: Cannot read property 'plugins' of undefined