Problem with save()

Ok, got it (honestly i haven't realized what the function E.on do, but anyway... at the moment is working).

E.on('init', function(){
  
var wifi = require("Wifi");
  wifi.connect("ssid", {password: "password"},
   function(err){if(err)console.log(err);
                 else {
                   console.log("connesso!");
                   var http = require("http");
                   http.createServer(function (req, res) {
                   res.writeHead(200);
                   res.end("Hello World"); 
                   }).listen(8080);}});
   });

And after send the code, do a save(); to store the program from RAM to FLASH.

Thanks to everyone as pointed me to the solution.
Marco