verify contract have error, please help.

[lightrao]

$ npx hardhat verify --network rinkeby 0x574FfF7247E49cD8353fB24eE920D70E9eEAcfF3
Nothing to compile
Error in plugin @nomiclabs/hardhat-etherscan: Failed to obtain list of solc versions. Reason: Body Timeout Error

For more info run Hardhat with --show-stack-traces

My hardhat.config.js file:

require("@nomiclabs/hardhat-waffle");
require("dotenv").config();
require("@nomiclabs/hardhat-etherscan");

// This is a sample Hardhat task. To learn how to create your own go to
// https://hardhat.org/guides/create-task.html
task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
    const accounts = await hre.ethers.getSigners();

    for (const account of accounts) {
        console.log(account.address);
    }
});

// You need to export an object to set up your config
// Go to https://hardhat.org/config/ to learn more

/**
 * @type import('hardhat/config').HardhatUserConfig
 */
module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        rinkeby: {
            url: process.env.RINKEBY_RPC_URL,
            accounts: [process.env.PRIVATE_KEY],
            chainId: 4,
        },
        goerli: {
            url: process.env.GOERLI_RPC_URL,
            accounts: [process.env.PRIVATE_KEY],
            chainId: 5,
        },
    },
    solidity: "0.8.8",
    etherscan: {
        apiKey: process.env.ETHERSCAN_API_KEY,
    },
};

// set proxy
// https://github.com/NomicFoundation/hardhat/issues/1280
// https://github.com/NomicFoundation/hardhat/pull/1291
// https://stackoverflow.com/questions/70393986/error-in-plugin-nomiclabs-hardhat-etherscan-the-contract-verification-failed/72845125#72845125
const { ProxyAgent, setGlobalDispatcher } = require("undici");
const proxyAgent = new ProxyAgent("http://127.0.0.1:7890"); // change to yours
setGlobalDispatcher(proxyAgent);

[fvictorio]

Failed to obtain list of solc versions. Reason: Body Timeout Error

That seems like an internet connection issue. Try again a couple of times. Also, try running npx hardhat clean --global just in case that there's somethign wrong with the cached list of compilers.