How to add element template to custom bower bundle?

Developers Modeler
1

I have created custom bower bundle using bpmn-js library , everything is working great except element template. we added json file as exmaple here https://github.com/camunda/camunda-modeler/tree/master/docs/element-templates but has error Error: unrecognized element <bpmn:ServiceTask>(…) , Any idea how to implement element template with custom bower project , This is kind of road block we been stuck for last three days. I will appreciate if we can get some detail here.

index.js

var BpmnViewer = require('bpmn-js/lib/Modeler');
var camundaModdleDescriptor = require('camunda-bpmn-moddle/resources/camunda');
var additionalModules = [
  require('bpmn-js-properties-panel'),
  // 1. require camunda provider instead of the bpmn one (!)
  require('bpmn-js-properties-panel/lib/provider/camunda')
];
BpmnViewer.prototype._modules = BpmnViewer.prototype._modules.concat(additionalModules);
// 2. include camunda moddle descriptor
BpmnViewer.prototype._moddleExtensions = { camunda: camundaModdleDescriptor }

module.exports = BpmnViewer;