Hi I have the following code to draw timeline chart. It is giving me  Invalid 
column index undefined. Should be an integer in the range [0-3] error. Can 
anyone help?

<script type="text/javascript" 
src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization',
       'version':'1','packages':['timeline']}]}"></script>

<script type="text/javascript">
google.setOnLoadCallback(drawChart);
function drawChart() {
  
  var dataTable = new google.visualization.DataTable();
  dataTable.addColumn({ type: 'number', id: 'no' });
  dataTable.addColumn({ type: 'string', id: 'Project' });
  dataTable.addColumn({ type: 'date', id: 'Start Dt' });
  dataTable.addColumn({ type: 'date', id: 'End Dt' });
  dataTable.addRows([
[ 0, 'proj1', new Date(2013, 10, 29), new Date(2014, 5, 3) ],
[ 1, 'proj2',        new Date(2014, 2, 3),  new Date(2014, 6, 3) ],
[ 2, 'proj3',        new Date(2014, 1, 1),  new Date(2014, 12, 31) ],
[ 3, 'proj4',        new Date(2013, 10, 1),  new Date(2014, 4, 1) ],
[ 5, 'Mt5',  new Date(2013, 9, 3),  new Date(2014, 5, 3) ]]);
  var chart = new 
google.visualization.Timeline(document.getElementById('projects'));
  
  var options = {
timeline: { showRowLabels: false }
  };

  chart.draw(dataTable, options);
}
</script>

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