Android createButtonBar Force close

When I try to add a ButtonBar in a view or window I always get a "Force close" message.

var win = Titanium.UI.createWindow({title:'Tab 1',backgroundColor:'#fff'});
 
var toolbarview = Ti.UI.createView({
    backgroundColor:'#21BD15',
    height:100,
    width:400,
    top:0,
    right:0
});
 
var buttonBar = Titanium.UI.createButtonBar({id:'buttonbar', labels:['Left', 'Right'],backgroundColor:'#336699'});
 
toolbarview.add(buttonBar);
win.add(toolbarview);
win.open();