使用 truffle 编译时出现问题，卡在导入 openzeppelin

Question

I'm doing a tutorial on blockgeeks and have been stuck for hours.

This is the error i get when trying to compile my project

Compiling your contracts...
===========================
> Compiling @openzeppelin\contracts\token\ERC721\ERC721.sol
> Compiling @openzeppelin\contracts\token\ERC721\IERC721.sol
> Compiling @openzeppelin\contracts\token\ERC721\IERC721Receiver.sol
> Compiling @openzeppelin\contracts\token\ERC721\extensions\IERC721Metadata.sol
> Compiling @openzeppelin\contracts\utils\Address.sol
> Compiling @openzeppelin\contracts\utils\Context.sol
> Compiling @openzeppelin\contracts\utils\Strings.sol
> Compiling @openzeppelin\contracts\utils\introspection\ERC165.sol
> Compiling @openzeppelin\contracts\utils\introspection\IERC165.sol
> Compiling .\contracts\Migrations.sol
> Compiling .\contracts\virus.sol

ParserError: Expected string literal (path), "*" or alias list.
 --> /C/Users/Admin/virus/contracts/virus.sol:2:8:
  |
2 | import '@openzeppelin\contracts\token\ERC721\ERC721.sol';
  |        ^^^^^^^^^^^^^^^^

Compilation failed. See above.

This is the code for my solidity file.

pragma solidity >=0.4.22 <0.9.0;

import ""@openzeppelin\contracts\token\ERC721\ERC721.sol";

contract Virus is ERC721 {
  constructor() public ERC721("CryptoVirus", "Virus") {

  }
}

Any help would be appreciated as I am driving myself crazy with this. I have uninstalled and reinstalled truffle and openzeppelin and still no joy.

Thanks

Answer 1

You have a typo in your import statememnt.

import ""@openzeppelin\contracts\token\ERC721\ERC721.sol";

opens with two quote signs "" . Replace it to just one "

import "@openzeppelin\contracts\token\ERC721\ERC721.sol";