Timer example not working

I'm updating a project I have to work in the new 4.2.3 SDK but I I'm getting this error : 

Invalid '$.Toybox.Lang.Method() as Any' passed as parameter 1 of type '$.Toybox.Lang.Method() as Void'.

Here is the function: 

//Update the watch every 10 sec for the clock

function timerCallback() {

    WatchUi.requestUpdate();

}

function onLayout(dc) {

    var myTimer = new Timer.Timer();

    myTimer.start(method(:timerCallback), 1000, true);

}

Did I do something wrong?