I need Some help about hardhat.config.js

It’s Take for couple days showing me error When I try to custom chain base and base sepolia in my hardhat Please need some help

require("@nomicfoundation/hardhat-toolbox");
// require("@nomiclabs/hardhat-etherscan");
require(‘dotenv’).config();

const NETWORK_TESTNET_URL = process.env.NETWORK_TESTNET_URL;
const NETWORK_MAINNET_URL = process.env.NETWORK_MAINNET_URL;
const SEPOLIA_PRIVATE_KEY = process.env.SEPOLIA_PRIVATE_KEY;
const MAINNET_PRIVATE_KEY = process.env.MAINNET_PRIVATE_KEY;
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;

module.exports = {
solidity: {
version: “0.8.24”,
settings: {
optimizer: {
enabled: true,
runs: 200
}
}
},
networks: {
sepolia: {
url: NETWORK_TESTNET_URL,
accounts: [SEPOLIA_PRIVATE_KEY]
}
// mainnet: {
// url: NETWORK_MAINNET_URL,
// accounts: [MAINNET_PRIVATE_KEY]
// }
},
etherscan: {
apiKey: ETHERSCAN_API_KEY
}
};

What was the error you are seeing?