Laravel Export Excel doesn't return an excel file

Anyone can help me? I wanna do export excel. This is my controller code

     public function export(){
      $data['stok'] = Stokbarang::with('products')->get();
      $tgl = thisDay();
      return Excel::create('Stok'.$tgl, function($excel) use ($index) {
        $excel->sheet('New sheet', function($sheet) use ($data) {
            $sheet->loadView('panel.stok.excel',$data);
        });
      })->export('xls');
     }

But it doesn't return an Excel file. It return like this instead an excel file

wht should I do? pls somebody help me to fix this.. thanks in advanced

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