Chapter 4: TypeError: Overriding modifier is missing "override" specifier. /

[akirpach]

At the beginning of chapter 5 I try to compile previously added code in chapter 4 and receive the following output:

Here's my Greeter.sol code:
`pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";

contract Greeter is Ownable {
string private _greeting = "Hello, World!";
address private _owner;

constructor() {
    _owner = msg.sender;
}

modifier onlyOwner() {
    require(
        msg.sender == _owner,
        "Ownable: caller is not the owner!"
    );
    _;
}

function greet() external view returns(string memory) {
    return _greeting;
}

function setGreeting(string calldata greeting) external {
    _greeting = greeting;
}

function owner() public view returns(address) {
return _owner;
}

} `

[MarcoBerlot]

If you import Ownable from Zeppelin, there should be no need for you to write your own onlyOwner() modifier. Here's a working example

pragma solidity >= 0.4.0;

import "@openzeppelin/contracts/access/Ownable.sol";

contract Greeter is Ownable {

  string private _greeting = "Hello, World!";

  function greet() external view returns(string memory) { return _greeting; }

  function setGreeting(string calldata greeting) external onlyOwner {
    _greeting = greeting;
  }

}