Adding rawColumns sows error in yajra datatablein Laracvel 5.6

I am using laravel 5.6. I am facing error when I use rawColumns . But it works sometimes then shows error. "exception": "Symfony\Component\HttpKernel\Exception\NotFoundHttpException",

Here is my controller

return DataTables::of($item_data)
        ->addColumn('update', function ($item_data){
                 return '<input type="text" name="item_unit_price">';
        })
        ->addColumn('action', function ($item_data) {
            return '<a href="' . url('item-delete/'.$item_data->id) .'">Delete</a> ';
        })
        ->rawColumns(['update', 'action'])
        ->make(true);

Here is my ajax

"columns":[
            { "data": 'item_name' },
            { "data": 'tp_item_unit'},
            { "data": 'item_unit_price'},
            { "data": 'item_quantity'},
            { "data": 'item_sell' },
            { "data": 'update' },
            {data: 'action', orderable: false, searchable: false},

        ]
     });

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