Trying to use Express JS with React app and PostgreSQL DB for first time, I am following this tutorial, but editing slightly for my need (recipe storage). I am currently getting this error and not sure why...

TypeError: Cannot read properties of undefined (reading 'rows')
    at /Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/recipe_model.js:16:23
    at Query.callback (/Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/node_modules/pg-pool/index.js:415:18)
    at Query.handleError (/Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/node_modules/pg/lib/query.js:128:19)
    at Client._handleErrorMessage (/Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/node_modules/pg/lib/client.js:335:17)
    at Connection.emit (node:events:526:28)
    at /Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/node_modules/pg/lib/connection.js:114:12
    at Parser.parse (/Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/node_modules/pg-protocol/dist/parser.js:40:17)
    at Socket.<anonymous> (/Users/xx/Desktop/Programming/recipes/recipes/backend/node_postgres/node_modules/pg-protocol/dist/index.js:11:42)
    at Socket.emit (node:events:526:28)
    at addChunk (node:internal/streams/readable:315:12)

The relevant code from recipe_model.js

const getRecipe = () => {
  return new Promise(function (resolve, reject) {
    pool.query('SELECT * FROM recipes ORDER BY id ASC', (error, results) => {
      if (error) {
        reject(error)
      }
      resolve(results.rows)
    })
  })
}

Thanks for any assistance.