DataTables warning: table id=category-listing - Requested unknown parameter 'child_categories' for row 0, column 2. For more information about this error, please see http://datatables.net/tn/4

$(function() {

    $('#category-listing').DataTable({
      'serverSide':true,
      'processing':true,
      'paging':true,
      'order':[],
      'ajax':{
        'url':'/categories/ajaxIndex',
        'type':'post',
        'dataType': 'json',
        'headers': {
            'X-CSRF-Token': $('meta[name="csrfToken"]').attr('content'),
          },
      },
       "columns": [{ 
      "data": "id",
     },
    { 
      "data": "category",
     },
    { 
      /*"data": "child_categories",
      "name": "subcategory",*/
      "searchable": false, 
    },
    { 
      "data": "markup",
      "name": "markup",
    },
    { 
      "data": "status",
      "name": "Status",
    },
    { 
      "data": "id",
      "name":"action",
      "orderable":false,
    },
  
  ],
    
     "order": [[1, 'asc']],
     /* "columnDefs": [ {
    "targets": [ 0 ],
    "data": "name[, ]"
  } ],  */
      /*'fnCreateRow':function(nRow,aData,iDataIndex){
       // $(nRow).attr('id',aData[0]);
       // $('#category-listing tbody tr:eq('+iDataIndex+')').after($("<tr class='odd'><td colspan='7'> New row here </td></tr>"));


      },*/
       "language": {
        search: ""
      },
     /* 'columnDefs':[{
       "targets": 'no-sort',
          "orderable": false,
      }]*/
      
      "columnDefs": [{
      data: "id",
      'searchable'    : false, 
          render: function (data, type, row, meta) {
               return meta.row + meta.settings._iDisplayStart + 1;
          }
    },{
    "targets": 1,
    "data": "category",
    render: function ( data, type, row, meta ) {
      return data ;
    }
  },{
    
    "targets": 2,
    "data": "child_categories",
    "orderable": false,
    "searchable": false, 
    render: function (value, type, row) {
     if (type === 'display') { 
                        var val = [];
                        $.each(value, function(i, v){
                            val.push(v['category']);
                      })
                      return val;
                   }
    }        

  },{
    "targets": 3,
    "data": "markup",
    "render": function ( data, type, row, meta ) {
      return data ;
    }
  },{
    "targets": 4,
    "data": "status",
    "render": function ( data, type, row, meta ) {
      return data ==  1 ?'<span>Active</span>' :  '<span>Inactive</span>';
    }
  },{
    "targets": 5,
    "data": "id",
    'searchable'    : false, 
    /*"defaultContent": "<a title='Edit' data-toggle='tooltip' class='mx-2' href='/users/edit/'><i class='icon-note menu-icon icon-sm'></i></a><button>delete</button>",*/
    "render": function ( data, type, row, meta ) {
      return '<a title="Edit" data-toggle="tooltip" class="mx-2" href="/categories/edit/'+data+'"><i class="icon-note menu-icon icon-sm"></i></a><a title="Delete" data-toggle="tooltip" class="mx-2 remove-sc"  rel="<?= $this->Url->build(['controller' => 'categories','action' => 'delete']); ?>" data-id="'+data+'" onclick="return confirm(Are you sure ?);"><i class="icon-trash text-danger icon-sm icon-white"></i></a>';
    }

  }  ],
  "fnRowCallback" : function(nRow, aData, iDisplayIndex){
                $("td:first", nRow).html(iDisplayIndex +1);
               return nRow;
            },

    });

Edited by Colin - Syntax highlighting. Details on how to highlight code using markdown can be found in this guide.