I'm trying to verify pn Etherscan my contract, but getting this error. What could it be?

PS C:\Projects\HardHat TS2> npx hardhat verify --network rinkeby 0x9517F72c4b61A07fd0cF684eE7A74C18Eb36dad8
Nothing to compile
No need to generate any newer typings.
An unexpected error occurred:

[Error: ENOENT: no such file or directory, open 'C:\Projects\HardHat TS2\artifacts\build-info\bd5e1b48863d1c1801c0a0353cc35891.json'] {
  code: 'ENOENT',
  syscall: 'open',
  path: 'C:\\Projects\\HardHat TS2\\artifacts\\build-info\\bd5e1b48863d1c1801c0a0353cc35891.json'

contract to verify

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

contract NFT is ERC721URIStorage {
    constructor() ERC721("NFTforMarket", "NFT") {}

    using Counters for Counters.Counter;
    Counters.Counter private _tokenIds;

    function mint(string memory tokenURI) public returns (uint256) {
        uint256 newItemId = _tokenIds.current();
        _mint(msg.sender, newItemId);
        _setTokenURI(newItemId, tokenURI);
        return newItemId;
  • I think the first thing you should check is whether or not the .json file is in the expected path. C:\Projects\HardHat TS2\artifacts\build-info\bd5e1b48863d1c1801c0a0353cc35891.json
    – 0xCourtney
    Feb 9, 2022 at 3:48
  • I checked the pass and there is no file with that name. (( so what should I do next? How to use virual machine, is there any tutorials?
    – ra1n89
    Feb 9, 2022 at 13:09

4 Answers 4


I got this error too and this worked:

  1. Delete artifacts and cache folders
  2. run npx hardhat compile
  3. then verify

You will need to delete the files and recompile:

  1. run npx hardhat clean
  2. run npx hardhat compile
  3. try verify again.

npx hardhat clean deletes cache and artifacts :)


I just again used npm install --save-dev @nomiclabs/hardhat-etherscan


npx hardhat clean

fixed this problem for me.

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