Error HH8: There's one or more errors in your config file:

[NakeshTewari]

After changing the compiler version of solidity to

solidity: {
        compilers: [{ versions: "0.8.8" }, { versions: "0.6.6" }],
    },

On running - yarn hardhat compile. The HH8: error occurred. I am currently at lesson 7: 10:39:54

* Invalid value {"compilers":[{"versions":"0.8.8"},{"versions":"0.6.6"}]} for HardhatConfig.solidity.0 - Expected a value of type string.
  * Invalid value undefined for HardhatConfig.solidity.1.version - Expected a value of type string.
  * Invalid value undefined for HardhatConfig.solidity.2.compilers.0.version - Expected a value of type string.
  * Invalid value undefined for HardhatConfig.solidity.2.compilers.1.version - Expected a value of type string.
  
To learn more about Hardhat's configuration, please go to https://hardhat.org/config/



require("@nomiclabs/hardhat-etherscan")
require("@nomiclabs/hardhat-waffle")
require("hardhat-gas-reporter")
require("solidity-coverage")
require("hardhat-deploy")
require("dotenv").config()

// 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 = {
    //solidity: "0.8.8",
    solidity: {
        compilers: [{ versions: "0.8.8" }, { versions: "0.6.6" }],
    },
    defaultNetwork: "hardhat",
    networks: {
        ropsten: {
            url: process.env.ROPSTEN_URL || "",
            accounts: [],
        },
    },
    gasReporter: {
        enabled: process.env.REPORT_GAS !== undefined,
        currency: "USD",
    },
    etherscan: {
        apiKey: process.env.ETHERSCAN_API_KEY,
    },
    namedAccounts: {
        deployer: {
            deployer: 0,
        },
    },
    user: {
        default: 1,
    },
}

[alymurtazamemon]

@NakeshTewari It is version not versions

solidity: {
    compilers: [
        {
            version: "0.8.8",
        },
        {
            version: "0.6.6",
        },
    ],
},