Single Stream - doesn't work

Single Stream

List myList = new List();
    	
Stream myStream = new Stream.fromIterable(myList);
StreamController controller = new StreamController();
controller.stream.listen((_)
{
    print("stream listen, data: $_");
});
controller.addStream(myStream)
.then((_)
{
    print("ready");
    controller.add("sup");
})
.catchError((error)
{
    print("some error");
});