MongoDB ailed to create product document

I hope this is the right place to discuss the CRUD issues. So I'm building a MERN e-commerce app, where I created the mongoose schema and connected with MongoDB to store the products & users. To test my schema and routes I used Postman, and while other requests related to users were working as usual I faced a weird error in the case of adding new products since this is the most important feature.

I'm not sure what is this error and why is this error occurring.
This is my POST request body -

const Product = require("../models/Product");
const router = require("express").Router();

//   CREATE PRODUCT
router.post("/", verifyTokenAndAdmin, async (req, res) => {
  const newProduct = new Product(req.body);

  try {
    const savedProduct = await newProduct.save();
    res.status(200).json(savedProduct);
  } catch (err) {
    res.status(500).json(err);
  }
});

The verifyToken is a JWT token.

Here is the Schema

const mongoose = require("mongoose");

const ProductSchema = new mongoose.Schema(
    {
        prodId: {
            type: String,
            required: true,  
        },
        prodName: {
            type: String,
            required: true,
        },
        brandName: {
            type: String,
            required: true,
        },
        img: {
            type: Array,
        },
        color: {
            type: Array,
        },
        size: {
            type: Object,
        },
        fabricSpecs: {
            type: String,
        },
        model: {
            type: String,
        },
        descDetail: {
            type: String,
        },
        price: {
            type: Number,
            required: true
        },
        discount: {
            type: Boolean
        },
        discountAmount: {
            type: Number
        },
        rating: {
            type: String
        },
        review: {
            type: Number
        },
        soldOut: {
            type: Boolean
        },
        category: {
            type: String,
        },
        type: {
            type: String,
        }
    },
    {
        timestamps: true,
    }
);

module.exports = mongoose.model("Product", ProductSchema);

Here is the error shown in the Postman while adding creating another product

Tried mongo shell also but getting the same error