how i can get all fields of mrp.workorder models ? when i run this code i receive this error:ValueError: Expected singleton: mrp.workcenter(1, 2, 4, 3) code:

async getWorkOrderFromOdoo(req, res) {
    getConnectionOdoo(function (err) {
      odoo.execute_kw(
        'mrp.workorder',
        'search_read',
        [
          [
            [
           
            ]
          ],
          {
            fields: [],
            limit: 5
          }
        ],
        function (err, value) {
          if (err) {
            return console.log(err);
          }
          value.forEach((element) => console.log(element));
          console.log('workorder Result: ', value);
        }
      );
    });
  }