TypeError: oj.FlattenedTreeDataSource is not a constructor

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TypeError: oj.FlattenedTreeDataSource is not a constructor

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Hi All,

Need quick help from you on the Row Expander (tree table).

I have used the below code and getting the below error (highlighted the error line in Red color), the same code is working for my friend but not for me as I started the design from scratch, not sure if I am missing some imports or something. Please provide your valuable suggestions on this.

Error: TypeError: oj.FlattenedTreeDataSource is not a constructor

Code in JS:

 

define(['knockout', 'ojs/ojflattenedtreetabledatasource', 'ojs/ojjsontreedatasource'], function (ko) {

  'use strict';

 

  var PageModule = function