require is not defined

[ZiGGy01011010]

Just installed the latest version of the plugin. On the page I created a region of type dhtmlxGantt. I received the error "require is not defined" in the console.

Here is the part of the page generated by Apex where the error occurred:

<script type="text/javascript">
apex.da.initDaEventList = function(){
apex.da.gEventList = [
{"name":"New","bindEventType":"ready","anyActionsFireOnInit":false,actionList:[{"eventResult":true,"executeOnPageInit":false,"stopExecutionOnError":true,javascriptFunction:function (){ 
require(['knockout', 'ojs/ojbootstrap', 'ojs/ojflattenedtreedataproviderview', 'ojs/ojarraytreedataprovider', 'ojs/ojknockouttemplateutils',

   'ojs/ojknockout', 'ojs/ojtable', 'ojs/ojrowexpander'],

  function (ko, Bootstrap, FlattenedTreeDataProviderView,

    ArrayTreeDataProvider, KnockoutTemplateUtils) {

    function ViewModel() {

      this.datasource = ko.observable();

      this.KnockoutTemplateUtils = KnockoutTemplateUtils;

      var arrayTreeDataProvider = new ArrayTreeDataProvider(JSON.parse(jsonData), { keyAttributes: 'id' });

      this.datasource(new FlattenedTreeDataProviderView(arrayTreeDataProvider,

        { expanded: this.expanded }));

    } Bootstrap.whenDocumentReady().then(

      function () {  ko.applyBindings(new ViewModel(), document.getElementById('tableWrapper'));  } );

  });
},"action":"NATIVE_JAVASCRIPT_CODE"}]}];
}
</script>

Apex version 23.1.2.