Lesson 3: Withdraw - "gas estimation failed" message

[LimbicAutomaton]

Hi when I use the withdraw() function, I get a "Gas estimation failed" message:
"Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
gas required exceeds allowance (30000000)"

I'm a bit confused about how to rectify this?

Code below

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

import "./PriceConverter.sol";

contract FundMe{
using PriceConverter for uint256;

uint256 public minimumUsd = 50 * 1e18;

address[] public funders;
mapping(address=> uint256) public addressToAmountFunded;

address public owner;

// constructors are functions that are deployed immediately when a contract is deployed
constructor(){
    owner = msg.sender; //msg.sender is whoever deployed contract (initially)
}


function fund() public payable{
//require(msg.value.getConversionRate() >= minimumUsd, "didn't send enough!"); // message.value is value of eth sent
funders.push(msg.sender); // this is address of who sent
addressToAmountFunded[msg.sender] = msg.value;
}

function withdraw() public onlyOwner{
    //require(msg.sender == owner, "Sender is not owner!"); // this line ensures that only owner can withdraw funds
    // for loop
    // [1, 2, 3, 4]
    /*starting index, ending index, step amount*/
    // ++ means + 1
    for(uint256 funderIndex = 0; funderIndex < funders.length; funderIndex = funderIndex ++){
        address funder = funders[funderIndex];
        addressToAmountFunded[funder] = 0;
    }
    // reset the array now funds set to zero 
    funders = new address [](0);


    // msg.sender = address
    // payable(msg.sender) = payable address 

    // transfer
  //  payable (msg.sender).transfer(address(this).balance); //automatically reverts
    // send
   // bool sendSuccess = payable (msg.sender).send(address(this).balance);
   // require(sendSuccess, "Send failed"); // will not revert unless this included
    // call
    (bool callSuccess, ) = payable (msg.sender).call{value: address(this).balance}(""); // comma then blank regognizes second variable - but don't care
    require(callSuccess, "Call failed");
}

modifier onlyOwner{ // if this function is called, its requirements must be met to implement function
require(msg.sender == owner, "Sender is not owner!");
_; //this represents "do the rest of the code"
}
}

[rin-st]

try to change funderIndex = funderIndex ++ to funderIndex ++

[LimbicAutomaton]

it worked - thanks!