这是我的导入语句
pragma solidity ^0.4.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
这是我不断收到的错误:
ParserError: Source "@openzeppelin/contracts/token/ERC20/ERC20.sol" not found: File not supplied initially.\nimport "@openzeppelin/contracts/token/ERC20/ERC20.sol"