OK. I downloaded your effetti di animazione .aia and built it on my PC. It works fine. Nice flying bird!
My explanation for your problem is that the QR-code became invalid because of the update you saw.
And anyway, the QR-codes stay valid for ony two hours, so you cannot use them the next day.
Try building again and it should work. Maybe clear the cache of your browser also.
And, as Taifun said, use the production server if you do not have a real reason to use the test server.