Again i have a new question.

this is the full erorr. TypeError: Indexed expression has to be a type, mapping or array (is function (address) view returns (uint256)) --> Untitleded.sol:39:17: | 39 | require(balanceOf[msg.sender] >= _value); | ^^^^^^^^^

Im using solidity 0.8.3. Im making a ETRC 20 token(I copied some code from someone with an older version of solidity and fixed some other bugs) Iv seen another post with this erorr but i dint understand it and they where using another version that i was not.

pragma solidity 0.8.3;

abstract contract zylus {

    mapping (address => uint256) public _balances;

    mapping (address => mapping (address => uint256)) public _allowances;

    uint256 public _totalSupply = 1000000000000000;

    string public _name = 'Zylus';
    string public _symbol = 'zyl';
    uint8  public _decimals = 6;

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    function name() public view returns (string memory){
        return _name;

    function symbol() public view returns (string memory){
        return _symbol;
    function decimals() public view returns (uint8){
        return _decimals;

    function totalSupply() public view returns (uint256){
        return _totalSupply;
    function balanceOf(address _owner) public view returns (uint256 balance){
        return _balances[_owner];
    function transfer(address _to, uint256 _value)view public returns (bool success){
        require(balanceOf[msg.sender] >= _value);
        require(balanceOf[_to] + _value >= balanceOf[_to]);
        balanceOf[msg.sender] -= _value;   
        balanceOf[_to] += _value;
        emit transfer(msg.sender, _to, _value);
        return true;                         
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
    function approve(address _spender, uint256 _value) public returns (bool success);
    function allowance(address _owner, address _spender) public view returns (uint256 remaining);


Thanks for the help.

1 Answer 1


Yes i am respondign to my own answer. i fixed iti. its bc i needed to replace the balnaceof with _balances. I think. thank you.

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