Storage.write not working when using save on send

wifi.on ('connected', function () {
   console.log ('Connected to Wifi. IP address is:', wifi.getIP () .ip);
   setTimeout (start server, 400);
});

I do not think that 'storage.write ("1.css", ...) is fast enough before the server starts, so I used a delay, maybe it should be different on your system.
I tried with 'setTimeout (StartServer, 400);' and got this picture on screen.
Hope it will take you on.