Uncaught TypeError: Cannot read property 'ColumnDefinition' of undefined

@Omed wrote:

Getting error while creating column defination. Followed this - http://opensource.addepar.com/ember-table-addon/#/documentation

tableColumns: Ember.computed(function(){
  let columns = columnArray.map(function(key){
      return Ember.Table.ColumnDefinition.create({
        savedWidth: 150,
        textAlign: 'text-align-center',
        headerCellName: key.w(),
        contentPath: key
      })
  })
  return columns;
}),

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