Lesson 7 Error: could not decode result data (value="0x", info={ "method": "priceFeed", "signature": "priceFeed()" }, code=BAD_DATA, version=6.7.1)

[kotysky]

Hi, I have this error trying to test FundMe contract.
I must be blind, I cannot fix it after long hours, I´ve unistalled packages , installed other packages, I´ve follow all other forums solutions, but, nothing better than this, at least I´ve arrived to priceFeed() function, before that, the Fudme contract wasnt deployed, and it was another nightmare to solve.
plese some help?

Error:

//
 FundMe
    constructor
      1) sets the aggregator addresses correctly


  0 passing (1s)
  1 failing

  1) FundMe
       constructor
         sets the aggregator addresses correctly:
     Error: could not decode result data (value="0x", info={ "method": "priceFeed", "signature": "priceFeed()" }, code=BAD_DATA, version=6.7.1)
      at makeError (node_modules/ethers/src.ts/utils/errors.ts:685:21)
      at assert (node_modules/ethers/src.ts/utils/errors.ts:702:25)
      at Interface.decodeFunctionResult (node_modules/ethers/src.ts/abi/interface.ts:916:15)
      at staticCallResult (node_modules/ethers/src.ts/contract/contract.ts:332:35)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)
      at staticCall (node_modules/ethers/src.ts/contract/contract.ts:289:24)
      at Proxy.priceFeed (node_modules/ethers/src.ts/contract/contract.ts:337:41)
      at Context.<anonymous> (test/unit/FundMe.test.js:25:30)



error Command failed with exit code 1.
//

FundMe.test.js

//
const { network, deployments, ethers, getNamedAccounts } = require("hardhat")
const { assert } = require("chai")
const { developmentChains } = require("../../helper-hardhat-config")

describe("FundMe", async function () {
    let fundMe
    let deployer
    let mockV3Aggregator

    beforeEach(async () => {
        //Deploy FundMe
        // using Hardhat-deploy
        //const accounts = await ethers.getSigners()
        //const acccountZero = accounts[0]
        deployer = (await getNamedAccounts()).deployer
        await deployments.fixture(["all"])
        fundMe = await ethers.getContractAt("FundMe", deployer)
        mockV3Aggregator = await ethers.getContractAt(
            "MockV3Aggregator",
            deployer
        )
    })
    describe("constructor", function () {
        it("sets the aggregator addresses correctly", async () => {
            const response = await fundMe.priceFeed()
            assert.equal(response, mockV3Aggregator.address)
        })
    })
})
//

01-deploy-fund-me.js

//

module.exports.default = deployFunc

/*module.exports = async (hre) => {
    const { getNamedAccounts, deployments } = hre
}*/
const { networkConfig, developmentChains } = require("../helper-hardhat-config")
const { network } = require("hardhat")
const { verify } = require("../utils/verify")
require("dotenv").config()

module.exports = async ({ getNamedAccounts, deployments }) => {
    const { deploy, log } = deployments
    const { deployer } = await getNamedAccounts()
    const chainId = network.config.chainId

    //const ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
    let ethUsdPriceFeedAddress

    if (developmentChains.includes(network.name)) {
        const ethUsdPriceFeed = await deployments.get("MockV3Aggregator")

        ethUsdPriceFeedAddress = ethUsdPriceFeed.address
    } else {
        ethUsdPriceFeedAddress = networkConfig[chainId]["ethUsdPriceFeed"]
    }
    log("----------------------------------------------------")
    log("Deploying FundMe and waiting for confirmations...")
    const args = [ethUsdPriceFeedAddress]

    const fundMe = await deploy("FundMe", {
        from: deployer,
        args: args,
        log: true,
        waitConfirmations: network.config.blockConfirmations || 1,
    })
    log(`FundMe deployed at ${fundMe.address}`)
    if (
        !developmentChains.includes(network.name) &&
        process.env.ETHERSCAN_API_KEY
    ) {
        await verify(fundMe.address, args)
    }
    module.exports.tags = ["all", "fundme"]
}
//

hardhat.config.js

//
require("@nomicfoundation/hardhat-toolbox")
//require("solhint")
require("@nomicfoundation/hardhat-chai-matchers")
//require("hardhat-gas-reporter")
//require("@nomiclabs/hardhat-ethers")
require("dotenv").config()
//require("solidity-coverage")
require("hardhat-deploy")

const SEPOLIA_RPC_URL = process.env.SEPOLIA_RPC_URL
const PRIVATE_KEY = process.env.PRIVATE_KEY
const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY
const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY
module.exports = {
    //solidity: "0.8.8",

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

    networks: {
        sepolia: {
            url: SEPOLIA_RPC_URL,
            accounts: [PRIVATE_KEY],
            chainId: 11155111,
            blocksConfirmations: 6,
        },
    },
    gasReporter: {
        enabled: false,
        outputFile: "gas-report.txt",
        noColor: true,
        currency: "USD",
        coinmarketcap: COINMARKETCAP_API_KEY,
        token: "MATIC",
    },

    etherscan: {
        apiKey: process.env.ETHERSCAN_API_KEY,
    },

    namedAccounts: {
        deployer: {
            default: 0,
        },
        user: {
            default: 1,
        },
    },
}
//

package.json

{
  "devDependencies": {
    "@chainlink/contracts": "^0.6.1",
    "@nomicfoundation/hardhat-chai-matchers": "1",
    "@nomicfoundation/hardhat-ethers": "^3.0.0",
    "@nomicfoundation/hardhat-network-helpers": "^1.0.9",
    "@nomicfoundation/hardhat-toolbox": "^3.0.0",
    "@nomicfoundation/hardhat-verify": "^1.0.0",
    "@nomiclabs/hardhat-ethers": "^2.2.3",
    "@nomiclabs/hardhat-etherscan": "^3.1.7",
    "@typechain/ethers-v6": "^0.5.0",
    "@typechain/hardhat": "^9.0.0",
    "chai": "^4.3.9",
    "deploy": "^1.0.3",
    "hardhat": "^2.17.3",
    "hardhat-deploy": "^0.11.37",
    "hardhat-gas-reporter": "^1.0.9",
    "solidity-coverage": "^0.8.5",
    "typechain": "^8.3.1"
  },
  "dependencies": {
    "dotenv": "^16.3.1",
    "ethers": "6.7.1",
    "solhint": "^3.6.2"
  }
}
//

[Nlferu]

Hello @kotysky

The issue you are facing is because you are mixing ethers v5 (course) with ethers v6. Just downgrade your ethers to v5 and you will be good, otherwise fix your code to proper syntax with ethers v6 documentation.

best what i can tell you is do following to not mess up even more:

1. Delete node_modules folder
2. Copy package.json from course repository (for this lesson)
3. Override your package.json with copied dependencies
4. Run yarn in terminal to install all proper dependencies and now you should be good to follow course.

[kotysky]

Thanks for the help, but It doesnt work neither, but You has gave me an idea, I will begin the lesson again, and I will install just the needed version of packages for the course, I hope it could be a little less tricky to follow the course.

[Nlferu]

@kotysky

Thats good idea, let me know if it worked for you. Also please remember to include all installed packages in hardhat.config otherwise you will keep facing issues.

[kotysky]

Ok, If ia make what I said before, then there are a lot of problems too, but if I install the github repo and delete the files we will work on them, then all works properly except the sepolia network for verifiyng.
Work with obsolete packages is dificult to solve some issues, but, I am learnig a lot!

[Trong-Tra]

I also faced a similar issue and managed to resolve it using #5884, head over and check it out you might find it helpful

[kotysky]

thanks, I will try.

[kotysky]

@AgonyThorn, thanks for the reference, it works fine!

[Trong-Tra]

Glad I could help