文件導入回調不支持 import ‘./IERC20.sol’;

當我嘗試編譯我的契約時，我看到這樣的錯誤：

DemirelToken.sol

https://eksiup.com/p/4z49413damc3

這是程式碼：

   pragma solidity ^0.5.0;

import "node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";

contract DemirelToken is ERC20, ERC20Detailed {
   constructor(uint256 initialSupply) ERC20Detailed("Gold", "GLD", 18) public {
       _mint(msg.sender, initialSupply);
   }
}

我收到這樣的錯誤：

node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol:3:1: ParserError: Source “node_modules/openzeppelin-solidity/contracts/token/ERC20/IERC20.sol” not found: File import callback not supported import " ./IERC20.sol"; ^——————–^ ,node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol:4:1: ParserError: Source “node_modules/openzeppelin -solidity/contracts/math/SafeMath.sol”未找到：文件導入回調不支持導入“../../math/SafeMath.sol”；^——————-^ ,node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol: 3:1: ParserError: Source “node_modules/openzeppelin-solidity/contracts/token/ERC20/IERC20.sol” not found: File import callback not supported import “./IERC20.sol”;

您需要修復導入中的路徑：

pragma solidity ^0.5.0;

import "../node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "../node_modules/openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";

contract DemirelToken is ERC20, ERC20Detailed {
   constructor(uint256 initialSupply) ERC20Detailed("Gold", "GLD", 18) public {
       _mint(msg.sender, initialSupply);
   }
}

確保您在項目中安裝了 openzeppelin-solidity

npm install openzeppelin-solidity

您的導入如下：

pragma solidity ^0.5.0;

import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";

contract DemirelToken is ERC20, ERC20Detailed {
   constructor(uint256 initialSupply) ERC20Detailed("Gold", "GLD", 18) public {
       _mint(msg.sender, initialSupply);
   }
}

引用自：https://ethereum.stackexchange.com/questions/72715