ERC20 transfer not working

Question

I am new to Solidity programming and trying to use ERC20 openzeppelin contract to send tokens using transfer function. Following example code:

Token.sol file

pragma solidity >=0.8.7;

import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol';

contract Token is ERC20 {
    constructor(string memory name, string memory symbol) ERC20(name, symbol) {}
}

TransferToken.sol file

pragma solidity >=0.8.7;

import './6_Token.sol';

contract TransferToken {

  function transfer() external {
    Token token = Token(msg.sender);
    token.transfer(0x617F2E2fD72FD9D5503197092aC168c91465E7f2, 1 ether);
  }  
}

When I click on transfer button in Remix, below error throws.

transact to TransferToken.transfer pending ... transact to TransferToken.transfer errored: VM error: revert. revert The transaction has been reverted to the initial state. Note: The called function should be payable if you send value and the value you send should be less than your current balance. Debug the transaction to get more information.

I am able to make transfer without using ERC20 implementation such as recipient.transfer(1 ether) works fine after depositing ether into calling smart contract. But the same does not work when using Token.transfer from openzeppelin ERC20.

Please help to understand what could be the problem.

Thanks!

Answer 1

you can not mint ERC20 token in your account first mint token in your account after you can transfer to anyone that token.

Try this :

Token.sol

pragma solidity >=0.8.7;

import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol';

contract Token is ERC20 {
    constructor(string memory name, string memory symbol , uint256 supply) ERC20(name, symbol) {
            _mint(msg.sender,supply * 10 ** decimals())
}
}