1

I'm struggling with this error, the contract is from a famous Blockchain Dev Youtuber Hashlips and i've used it months ago without error, but now when i put it into REMIX Ide it gives me this error.

Someone could help me?

ERC721A Contract: https://github.com/hashlips-lab/nft-erc721-collection/blob/main/smart-contract/contracts/YourNftToken.sol

from solidity:
DeclarationError: Identifier not found or not unique.
  --> contracts/YourNftToken.sol:13:9:
   |
13 |   using Strings for uint256;
   |         ^^^^^^^
Improve this question

1 Answer 1

Reset to default
0

The error says it cannot find where Strings is declared, I checked your repo and you are not importing that library from anywhere, to solve it just import the library Strings.

Improve this answer
1
  • Tried to import Strings.sol from openzeppelin Library... now it gives this error: TypeError: Function needs to specify overridden contracts "ERC721A" and "IERC721A". --> Nuivo.sol:80:59: | 80 | function tokenURI(uint256 _tokenId) public view virtual override returns (string memory) { | ^^^^^^^^ Note: This contract: --> erc721a/contracts/ERC721A.sol:32:1: | 32 | contract ERC721A is IERC721A { | ^ (Relevant source part starts here and spans across multiple lines). Note: This contract:....
    – Pietro Ciattaglia
    Jun 30, 2022 at 8:42

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.