Vaadin Chart addPointClickListener

Hello all,

I have been trying to use charts addPointClickListener, but I am getting this warning and my method is not executed

Aug 04, 2015 2:05:24 PM com.vaadin.server.communication.ServerRpcHandler parseServerRpcInvocation
WARNING: Ignoring RPC call to com.vaadin.addon.charts.client.ui.ChartServerRpc.onPointClick in connector com.vaadin.addon.charts.Chart(103) as no RPC implementation is registered

    chart.addPointClickListener(new PointClickListener() {
        public void onClick(PointClickEvent event) {
            DataSeries ds = (DataSeries) event.getSeries();