Missing required parameter - file (Express/Node/Multer)

I am getting the below error when I try to upload a file using cloudinary:

message: 'Missing required parameter - file',
name: 'Error',
http_code: 400

Controller:

export default async function CreateNewProduct(req, res, next) {

try {

console.log('Request body: ', req);

const imgUpload = await cloudinary.uploader.upload(req.file);

// Create new product with image data

let newProduct = newProduct({

name:req.body.name,

description:req.body.description,

price:req.body.price,

category:req.body.category,

quantity:req.body.quantity,

shipping:req.body.shipping,

cloudinary_id: imgUpload.public_id,

file:imgUpload.secure_url,

});

await newProduct.save();

res.json(newProduct);

} catch (error) {

console.log('Error uploading image: ', error);

res.send(error);

}

next();

}

My route:

router.post(

'/new-product/create/:userId',

upload.single('file'),

CreateNewProduct,

(req, res) => {

if (!req.file) {

throwError('File missing');

} else {

res.send('success');

}

);

App.js

app.use(

fileUpload({

useTempFiles:true,

tempFileDir:'/tmp/',

})

);

app.use(express.json());