knockoutjs 1.3PRE “This template engine does not support anonymous templates nested within its templates”

http://stackoverflow.com/questions/8294515/knockoutjs-1-3pre-this-template-engine-does-not-support-anonymous-templates-nes

HTML

<script src="http://ajax.aspnetcdn.com/ajax/knockout/knockout-3.3.0.js"></script>
<span class="disabled" data-bind="click: alerting">Two</span>

JavaScript

var viewModel = {
    alerting: function(data, e) {
    	 if(e.target.className === "disabled") {
       	return;
       }
       alert("two");
    }
};

ko.applyBindings(viewModel);