lesson 13, error Error: VM Exception while processing transaction: reverted with reason string 'SafeERC20: low-level call failed'

[leung100]

got error back while trying to run scripts/aaveBorrow.js

Error: VM Exception while processing transaction: reverted with reason string 'SafeERC20: low-level call failed'
    at <UnrecognizedContract>.<unknown> (0x7d2768de32b0b80b7a3454c06bdac94a69ddc7a9)
    at <UnrecognizedContract>.<unknown> (0x7d2768de32b0b80b7a3454c06bdac94a69ddc7a9)

error in the terminal:

scripts/aaveBorrow.js:

const { ethers, getNamedAccounts } = require("hardhat")
const { getWeth, AMOUNT } = require("./getWeth")

async function main() {
    await getWeth()
    const { deployer } = await getNamedAccounts()
    const lendingPool = await getLendingPool(deployer)
    console.log(`lendingPool address is: ${lendingPool.address}`)

    // deposit
    const wethTokenAddress = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
    // approve
    approveErc20(wethTokenAddress, lendingPool.address, AMOUNT, deployer)
    console.log("depositing......")
    await lendingPool.deposit(wethTokenAddress, AMOUNT, deployer, 0)
    console.log("deposited!")
}

async function getLendingPool(account) {
    const lendingPoolAddressesProvider = await ethers.getContractAt(
        "ILendingPoolAddressesProvider",
        "0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5",
        account
    )
    const lendingPoolAddress = await lendingPoolAddressesProvider.getLendingPool()
    const lendingPool = await ethers.getContractAt("ILendingPool", lendingPoolAddress, account)
    return lendingPool
}
async function approveErc20(erc20Address, spenderAddress, amountToSpend, account) {
    const erc20Token = await ethers.getContractAt("IERC20", erc20Address, account)
    const tx = await erc20Token.approve(spenderAddress, amountToSpend)
    await tx.wait(1)
    console.log("approved")
}
main()
    .then(() => process.exit(0))
    .catch((error) => {
        console.error(error)
        process.exit(1)
    })

hardhat.config.js:

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

const MAINNET_RPC_URL = process.env.MAINNET_RPC_URL || process.env.ALCHEMY_MAINNET_RPC_URL || ""
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY || ""
const KOVAN_RPC_URL =
    process.env.KOVAN_RPC_URL || "https://eth-mainnet.alchemyapi.io/v2/your-api-key"
const PRIVATE_KEY = process.env.PRIVATE_KEY
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY || ""

module.exports = {
    defaultNetwork: "hardhat",
    networks: {
        hardhat: {
            chainId: 31337,
            forking: {
                url:
                    MAINNET_RPC_URL ||
                    "https://eth-mainnet.g.alchemy.com/v2/yej0nNvaIUD7Lgo6uIjE7M3BMR2smg7N",
            },
        },
        localhost: {
            chainId: 31337,
        },
        kovan: {
            url: KOVAN_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 42,
            blockConfirmations: 6,
        },
    },
    solidity: {
        compilers: [
            {
                version: "0.8.8",
            },
            {
                version: "0.6.12",
            },
            {
                version: "0.4.19",
            },
            { version: "0.6.6" },
        ],
    },
    etherscan: {
        apiKey: ETHERSCAN_API_KEY,
    },
    gasReporter: {
        enabled: true,
        currency: "USD",
        outputFile: "gas-report.txt",
        noColors: true,
        // coinmarketcap: COINMARKETCAP_API_KEY,
    },
    namedAccounts: {
        deployer: {
            default: 0, // here this will by default take the first account as deployer
            1: 0, // similarly on mainnet it will take the first account as deployer. Note though that depending on how hardhat network are configured, the account 0 on one network can be different than on another
        },
    },
}

hope someone can help me with this error, thank you

[alymurtazamemon]

@leung100 Please push the code to GitHub and leave link here I will check the issue.

[leung100]

github:

https://github.com/leung100/hardhat-defi-fcc.git

[alymurtazamemon]

@leung100 I checked your code. You did not wait for the approveErc20.

Add await here.

// approve
await approveErc20(wethTokenAddress, lendingPool.address, AMOUNT, deployer)

[sparrow313]

hey, @alymurtazamemon I am facing the same problem I think with the repay function... Please have a look !!

[alymurtazamemon]

@sparrow313 Create a separate discussion and tag me there, and also leave a link to your repo code there.

[leung100]

thank you very very much !!