Not verifying on eth scan

Support
1

Hi, I tried to create a ERC20 token using the wizard here https://docs.openzeppelin.com/contracts/4.x/wizard

For features, I checked (Burnable, Pausable, Snapshots, Permit), for access control I checked (Roles)

Then after opening in Remix & Compiling, the code does not verify on Etherscan.io,

here is the code // SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";

contract MyToken is ERC20, ERC20Burnable, ERC20Snapshot, AccessControl, Pausable, ERC20Permit {
    bytes32 public constant SNAPSHOT_ROLE = keccak256("SNAPSHOT_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    constructor() ERC20("My Token", "MYTOKEN") ERC20Permit("My Token") {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _setupRole(SNAPSHOT_ROLE, msg.sender);
        _setupRole(PAUSER_ROLE, msg.sender);
        _mint(msg.sender, 1000000000 * 10 ** decimals());
    }

    function snapshot() public {
        require(hasRole(SNAPSHOT_ROLE, msg.sender));
        _snapshot();
    }

    function pause() public {
        require(hasRole(PAUSER_ROLE, msg.sender));
        _pause();
    }

    function unpause() public {
        require(hasRole(PAUSER_ROLE, msg.sender));
        _unpause();
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount)
        internal
        whenNotPaused
        override(ERC20, ERC20Snapshot)
    {
        super._beforeTokenTransfer(from, to, amount);
    }
}
2

I think you should verify your code manually, and I think this tutorial can help you:

Verify smart contract inheriting from OpenZeppelin Contracts

3

i did uplode in multi-file format that also gives me error

4 
here is the error    


ParserError: Source "IERC20.sol" not found: File import callback not supported
 --> ERC20.sol:5:1:
  |
5 | import "./IERC20.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "extensions/IERC20Metadata.sol" not found: File import callback not supported
 --> ERC20.sol:6:1:
  |
6 | import "./extensions/IERC20Metadata.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "utils/Context.sol" not found: File import callback not supported
 --> ERC20.sol:7:1:
  |
7 | import "../../utils/Context.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/token/ERC20/ERC20.sol" not found: File import callback not supported
 --> token.sol:4:1:
  |
4 | import "@openzeppelin/contracts/token/ERC20/ERC20.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol" not found: File import callback not supported
 --> token.sol:5:1:
  |
5 | import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol" not found: File import callback not supported
 --> token.sol:6:1:
  |
6 | import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Snapshot.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/access/AccessControl.sol" not found: File import callback not supported
 --> token.sol:7:1:
  |
7 | import "@openzeppelin/contracts/access/AccessControl.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/security/Pausable.sol" not found: File import callback not supported
 --> token.sol:8:1:
  |
8 | import "@openzeppelin/contracts/security/Pausable.sol"
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

ParserError: Source "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol" not found: File import callback not supported
 --> token.sol:9:1:
  |
9 | import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol"
5

It looks like you do not install dependency, try to run:

npm i @openzeppelin/contracts
6

i am using remix. its works fine in local enviroment