I'm getting an error due to Burnable but it's not even in my contract.


abstract contract ERC721Burnable is Context, ERC721

ERC-721 Contract

pragma solidity ^0.6.0;

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

contract MyContract is ERC721 {

    mapping(uint256 => string) private _CIDS;
    using Counters for Counters.Counter;
    Counters.Counter private _tokenIds;
    mapping(string => uint8) hashes;

    constructor() ERC721("MYNFT", "MNT") public {

    function CID(uint256 tokenId) public view returns (string memory) {

      require(_exists(tokenId), "ERC721Metadata: CID query for nonexistent token");
      string memory _CID = _CIDS[tokenId];

      return _CID;

    function _setTokenCID(uint256 tokenId, string memory _CID) internal virtual {
      require(_exists(tokenId), "ERC721Metadata: CID set of nonexistent token");
      _CIDS[tokenId] = _CID;

    function mint(string memory _CID, string memory metadata) public {
      require(hashes[_CID] != 1);
      hashes[_CID] = 1;

      uint256 _newId = totalSupply() + 1;
      _safeMint(msg.sender, _newId);
      _setTokenCID(_newId, _CID);

      _setTokenURI(_newId, metadata);


npm install @openzeppelin/contracts

I re-installed open zeppelin contracts and that worked.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.