Error: VM Exception while processing transaction: reverted with reason string 'ERC721: transfer caller is not owner nor approved'

Question

i try to write NFT marketplace and i have problem with reselling items from user that buy item from owner and new, third user. I use next.js + openzeppelin + hardhat + infura and metamask. Creating and buying NFT is successful, all params on sell-item.js page getting correctly.

This is my function in NFTMarket.sol:

function resellToken(address nftContract, uint256 tokenId, uint256 price) public payable {
      require(idToMarketItem[tokenId].owner == msg.sender, "Only item owner can perform this operation");
      require(msg.value == listingPrice, "Price must be equal to listing price");
      idToMarketItem[tokenId].sold = false;
      idToMarketItem[tokenId].price = price;
      idToMarketItem[tokenId].seller = payable(msg.sender);
      idToMarketItem[tokenId].owner = payable(address(this));
      _itemsSold.decrement();

      IERC721(nftContract).transferFrom(msg.sender, address(this), tokenId);
    }

This is my web page:

import { useEffect, useState } from 'react'
import { ethers } from 'ethers'
import { useRouter } from 'next/router'
import axios from 'axios'
import Web3Modal from 'web3modal'

import {
    nftaddress, nftmarketaddress
} from '../config'

// import NFT from '../artifacts/contracts/NFT.sol/NFT.json'
import NFTMarket from '../artifacts/contracts/NFTMarket.sol/NFTMarket.json'

export default function ResellNFT() {
  const [formInput, updateFormInput] = useState({ price: '', image: '' })
  const router = useRouter()
  const { id, tokenUri } = router.query
  const { image, price } = formInput

  useEffect(() => {
    fetchNFT()
  }, [id])

  async function fetchNFT() {
    if (!tokenUri) return
    const meta = await axios.get(tokenUri)
    updateFormInput(state => ({ ...state, image: meta.data.image }))
  }

  async function listNFTForSale() {
    if (!price) return
    const web3Modal = new Web3Modal()
    const connection = await web3Modal.connect()
    const provider = new ethers.providers.Web3Provider(connection)
    const signer = provider.getSigner()

    const priceFormatted = ethers.utils.parseUnits(formInput.price, 'ether')
    const marketContract = new ethers.Contract(nftmarketaddress, NFTMarket.abi, signer)
    //const tokenContract = new ethers.Contract(nftaddress, NFT.abi, provider)
    let listingPrice = await marketContract.getListingPrice()    

    listingPrice = listingPrice.toString()
    let transaction = await marketContract.resellToken(nftaddress, id, priceFormatted, { value: listingPrice })
    await transaction.wait()
   
    router.push('/')
    
  }

  return (
    <div className="flex justify-center">
      <div className="w-1/2 flex flex-col pb-12">
        <input
          placeholder="Asset Price in Eth"
          className="mt-2 border rounded p-4"
          onChange={e => updateFormInput({ ...formInput, price: e.target.value })}
        />
        {
          image && (
            <img className="rounded mt-4" width="350" src={image} />
          )
        }
        <button onClick={listNFTForSale} className="font-bold mt-4 bg-pink-500 text-white rounded p-4 shadow-lg">
          List NFT
        </button>
      </div>
    </div>
  )
}

Error code:

    eth_estimateGas
  Contract call:       NFTMarket#resellToken
  From:                0x1cbd3b2770909d4e10f157cabc84c7264073c9ec
  To:                  0x5fbdb2315678afecb367f032d93f642f64180aa3
  Value:               0.025 ETH

  Error: VM Exception while processing transaction: reverted with reason string 'ERC721: transfer caller is not owner nor approved'
      at NFT.transferFrom (@openzeppelin/contracts/token/ERC721/ERC721.sol:156)
      at NFTMarket.resellToken (contracts/NFTMarket.sol:89)
      at EthModule._estimateGasAction (E:\маркетплейс\polygon-ethereum\node_modules\hardhat\src\internal\hardhat-network\provider\modules\eth.ts:425:7)
      at HardhatNetworkProvider._sendWithLogging (E:\маркетплейс\polygon-ethereum\node_modules\hardhat\src\internal\hardhat-network\provider\provider.ts:139:22)
      at HardhatNetworkProvider.request (E:\маркетплейс\polygon-ethereum\node_modules\hardhat\src\internal\hardhat-network\provider\provider.ts:116:18)
      at JsonRpcHandler._handleRequest (E:\маркетплейс\polygon-ethereum\node_modules\hardhat\src\internal\hardhat-network\jsonrpc\handler.ts:188:20) 
      at JsonRpcHandler._handleSingleRequest (E:\маркетплейс\polygon-ethereum\node_modules\hardhat\src\internal\hardhat-network\jsonrpc\handler.ts:167:17)
      at Server.JsonRpcHandler.handleHttp (E:\маркетплейс\polygon-ethereum\node_modules\hardhat\src\internal\hardhat-network\jsonrpc\handler.ts:52:21)

---

UPDATE: This is my smart contract of the marketplace

// SPDX-License-Identifier: MIT
pragma solidity 0.8.2;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract NFTMarket is ReentrancyGuard {
  using Counters for Counters.Counter;
  Counters.Counter private _itemIds;
  Counters.Counter private _itemsSold;

  address payable owner;
  uint256 listingPrice = 0.025 ether;

  constructor() {
    owner = payable(msg.sender);
  }

  struct MarketItem {
    uint256 itemId;
    address nftContract;
    uint tokenId;
    address payable seller;
    address payable owner;
    uint256 price;
    bool sold;
  }

  mapping(uint256 => MarketItem) private idToMarketItem;

  event MarketItemCreated (
    uint256 indexed itemId,
    address indexed nftContract,
    uint256 indexed tokenId,
    address seller,
    address owner,
    uint256 price,
    bool sold
  );

  function getListingPrice() public view returns (uint256) {
   return listingPrice;
  }

  function createMarketItem(
    address nftContract,
    uint256 tokenId,
    uint256 price
  ) public payable nonReentrant {
    require(price > 0, "Price must be at least 1 wei");
    require(msg.value == listingPrice, "Price must be equal to listing price");

    _itemIds.increment();
    uint256 itemId = _itemIds.current();

    idToMarketItem[tokenId] = MarketItem(
      itemId,
      nftContract,
      tokenId,
      payable(msg.sender),
      payable(address(0)),
      price,
      false
    );

    IERC721(nftContract).transferFrom(msg.sender, address(this), tokenId);

    emit MarketItemCreated(
      itemId,
      nftContract,
      tokenId,
      msg.sender,
      address(0),
      price,
      false
    );
  }

  function resellToken(address nftContract, uint256 tokenId, uint256 price) public payable {
      require(idToMarketItem[tokenId].owner == msg.sender, "Only item owner can perform this operation");
      require(msg.value == listingPrice, "Price must be equal to listing price");
      idToMarketItem[tokenId].sold = false;
      idToMarketItem[tokenId].price = price;
      idToMarketItem[tokenId].seller = payable(msg.sender);
      idToMarketItem[tokenId].owner = payable(address(this));
      _itemsSold.decrement();

      IERC721(nftContract).transferFrom(msg.sender, address(this), tokenId);
    }

  function createMarketSale(
    address nftContract,
    uint256 itemId
    ) public payable nonReentrant {
    uint price = idToMarketItem[itemId].price;
    uint tokenId = idToMarketItem[itemId].tokenId;
    require(msg.value == price, "Please sumbit the asking price in order to complete the purchase");

    idToMarketItem[itemId].seller.transfer(msg.value);
    IERC721 (nftContract).transferFrom(address(this), msg.sender, tokenId);
    idToMarketItem[itemId].owner = payable(msg.sender);
    idToMarketItem[itemId].sold = true;
    _itemsSold.increment();
    payable(owner).transfer(listingPrice);
  }

  function fetchMarketItems() public view returns (MarketItem[] memory) {
    uint ItemCount = _itemIds.current();
    uint unsoldItemCount = _itemIds.current() - _itemsSold.current();
    uint currentIndex = 0;

    MarketItem[] memory items = new MarketItem[](unsoldItemCount);
    for (uint i = 0; i < ItemCount; i++) {
      if (idToMarketItem[i + 1].owner == address(0)) {
        uint currentId = idToMarketItem[i + 1].itemId;
        MarketItem storage currentItem = idToMarketItem[currentId];
        items[currentIndex] = currentItem;
        currentIndex += 1;
      }
    }
    return items;
  }

   function fetchMyNFTs() public view returns (MarketItem[] memory) {
    uint totalItemCount = _itemIds.current();
    uint itemCount = 0;
    uint currentIndex = 0;

    for (uint i = 0; i < totalItemCount; i++) {
      if (idToMarketItem[i + 1].owner == msg.sender) {
        itemCount += 1;
      }
    }

    MarketItem[] memory items = new MarketItem[](itemCount);
    for (uint i = 0; i < totalItemCount; i++) {
      if (idToMarketItem[i + 1].owner == msg.sender) {
        uint currentId = idToMarketItem[i + 1].itemId;
        MarketItem storage currentItem = idToMarketItem[currentId];
        items[currentIndex] = currentItem;
        currentIndex += 1;
      }
    }
    return items;
  }

  function fetchItemsCreated() public view returns (MarketItem[] memory) {
    uint totalItemCount = _itemIds.current();
    uint itemCount = 0;
    uint currentIndex = 0;

    for (uint i = 0; i < totalItemCount; i++) {
      if (idToMarketItem[i + 1].seller == msg.sender) {
        itemCount += 1;
      }
    }

    MarketItem[] memory items = new MarketItem[](itemCount);
    for (uint i = 0; i < totalItemCount; i++) {
      if (idToMarketItem[i + 1].seller == msg.sender) {
        uint currentId = idToMarketItem[i + 1].itemId;
        MarketItem storage currentItem = idToMarketItem[currentId];
        items[currentIndex] = currentItem;
        currentIndex += 1;
      }
    }
    return items;
  }
}

This is the nfc creation code

import { useState } from 'react'
import { ethers } from 'ethers'
import { create as ipfsHttpClient } from 'ipfs-http-client'
import { useRouter } from 'next/router'
import Web3Modal from 'web3modal'
import {MPLayout} from '../../components/MPLayout'

const client = ipfsHttpClient('https://ipfs.infura.io:5001/api/v0')

import {
    nftaddress, nftmarketaddress
} from '../../config'

import NFT from '../../artifacts/contracts/NFT.sol/NFT.json'
import NFTMarket from '../../artifacts/contracts/NFTMarket.sol/NFTMarket.json'

export default function CreateItem () {
    const [fileUrl, setFileUrl] = useState(null)
    const [formInput, updateFormInput] = useState({ price: '', name: '', description: '' })
    const router = useRouter()

    async function onChange(e) {
        const file = e.target.files[0] 
        try {
            const added = await client.add(
                file,
                {
                    progress: (prog) => console.log('received: ${prog}')
                }
            )
            const url = `https://ipfs.infura.io/ipfs/${added.path}`
            setFileUrl(url)
        }   catch (e) {
            console.log(e)
        }
    }

    async function createItem() {
        const { name, description, price } = formInput
        if (!name || !description || !price || !fileUrl) return
        const data = JSON.stringify({
            name, description, image: fileUrl
        })

        try {
            const added = await client.add(data)
            const url = `https://ipfs.infura.io/ipfs/${added.path}`
            /* after file is uploaded to IPFS, return the URL to use it in the transaction */
            createSale(url)
        }   catch (error) {
            console.log('Error uploading file: ', error)
        }
    }

    async function createSale(url) {
        const web3Modal = new Web3Modal()
        const connection = await web3Modal.connect()
        const provider = new ethers.providers.Web3Provider(connection)
        const signer = provider.getSigner()

        let contract = new ethers.Contract(nftaddress, NFT.abi, signer)
        let transaction = await contract.createToken(url)
        let tx = await transaction.wait()

        let event = tx.events [0]
        let value = event.args[2]
        let tokenId = value.toNumber()

        const price = ethers.utils.parseUnits(formInput.price, 'ether')

        contract = new ethers.Contract(nftmarketaddress, NFTMarket.abi, signer)
        let listingPrice = await contract.getListingPrice()
        listingPrice = listingPrice.toString()

        transaction = await contract.createMarketItem(nftaddress, tokenId, price, { value: listingPrice})
        await transaction.wait()
        router.push('/')
    }

    return (
            <MPLayout title={'Create Item'}>
                <div className="flex justify-center">
                    <div className="w-1/2 flex flex-col pb-12">
                    <input 
                        placeholder="Asset Name"
                        className="mt-8 border rounded p-4"
                        onChange={e => updateFormInput({ ...formInput, name: e.target.value })}
                    />
                    <textarea
                        placeholder="Asset Description"
                        className="mt-2 border rounded p-4"
                        onChange={e => updateFormInput({ ...formInput, description: e.target.value })}
                        />
                        <input
                        placeholder="Asset Price in Eth"
                        className="mt-2 border rounded p-4"
                        onChange={e => updateFormInput({ ...formInput, price: e.target.value })}
                        />
                        <input
                        type="file"
                        name="Asset"
                        className="my-4"
                        onChange={onChange}
                        />
                        {
                            fileUrl && (
                                <img className="rounded mt-4" width="350" src={fileUrl} />
                            )
                        }
                        <button 
                            onClick={createItem} 
                            className="font-bold mt-4 bg-pink-500 text-white rounded p-4 shadow-lg"
                        >
                            Create Digital Asset 
                        </button>
                    </div>
                </div>
            </MPLayout>
    )
    
}

Answer 1

It seems that somewhere else in your code after initially creating the nft, the nft is not actually owned by idToMarketItem[tokenId].owner but by someone else. If you're creating the nft with _mint(...), your first parameter to _mint is probably wrong. If this doesn't help, can you share the code where you create the nft and also the code where you initially set idToMarketItem[tokenId].owner?

Answer 2

If you look at ERC721.sol you have this function

function transferFrom(address from, address to, uint256 tokenId
      ) public virtual override {

        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");  
        _transfer(from, to, tokenId);
    }

You are calling this function but you are not satisfying the require stament:

require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

In smart contracts, if you are transfering from another address, you have to be authorized to do it. You cannot just go transfer something from any account. So before you call transferFrom, you have to call this first

function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }