Error: contract runner does not support sending transactions (operation="sendTransaction", code=UNSUPPORTED_OPERATION, version=6.10.0)

[MTD26]

Issue: Trouble with FundMe Contract

I'm currently facing an issue with the FundMe contract in the fundMe.test.js file. I suspect there might be an error in the fund and withdraw process. The error seems to be related to the fundTxResponse block. Any assistance would be highly appreciated.

File: fundMe.test.js

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

developmentChains.includes(network.name)
  ? describe.skip
  : describe("FundMe", async function () {
      let fundMe;
      let deployer;
      const sendValue = "10000000000000000000";
      let MockV3Aggregator;
      beforeEach(async function () {
        deployer = ethers.provider.getSigner();
        fundMe = await ethers.getContractAt(
          "FundMe",
          (await deployments.get("FundMe")).address,
          deployer
        );

        /* fundMe = await ethers.getContract("FundMe", deployer);*/
      });
      it("allows people to fund and withdraw", async function () {
        
        // Issue: Believing the error is here
        const fundTxResponse = await fundMe.fund({ value: sendValue });
        await fundTxResponse.wait(1);
        const withdrawTxResponse = await fundMe.withdraw();
        await withdrawTxResponse.wait(1);

        const endingFundMeBalance = await fundMe.provider.getBalance(
          fundMe.address
        );
        console.log(
          endingFundMeBalance.toString() +
            " should equal 0, running assert equal..."
        );

        assert.equal(endingBalance.toString(), "0");
      });
    });


### Issue: Error during FundMe Contract Test

#### Error:
```bash
Error: contract runner does not support sending transactions (operation="sendTransaction", code=UNSUPPORTED_OPERATION, version=6.10.0)
  at makeError (node_modules/ethers/src.ts/utils/errors.ts:694:21)
  at assert (node_modules/ethers/src.ts/utils/errors.ts:715:25)
  at send (node_modules/ethers/src.ts/contract/contract.ts:310:15)
  at Proxy.fund (node_modules/ethers/src.ts/contract/contract.ts:352:22)
  at Context.<anonymous> (test/staging/FundMe.staging.test.js:24:45)

#### Relevant package.json depdnecies:
{
  "name": "hardhat-fund-me",
  "version": "1.0.0",
  "devDependencies": {
    "@nomicfoundation/hardhat-ethers": "^3.0.0",
    "ethers": "^6.4.0",
    "hardhat": "^2.19.4"
    // Add other relevant dependencies
  }
}

#### Goerli Etherscan Information:
- FundMe Contract Address on Goerli: 0xa7a75C37cd60900fC315df0a449a528779Bf0f94
- Price Feed Address on Goerli: 0xd4a33860578de61dbabdc8bfdb98fd742fa7028e


THank you for your time.

[SimSimButDifferent]

One thing to note is that ethers was on version 5 in the tutorial... Version 6 has seen quite a few syntax changes, so if you are working with ethers V6, which it looks like you are using ethers 6.10.0. You should check the page below.
https://docs.ethers.org/v6/migrating/
I have found this guide very useful.

If you want the code to run the same as in the tutorial run:

yarn remove ethers

then

yarn add --dev ethers@^5.5.3

If the problem still persists, you can send me a link to your repo and I can have a closer look.

[MTD26]

Hey, thank you so much for your time and help. As I am a beginner this is super helpful.

Because of your help a was able to get rid of the error but I am encountering a new one:

Error:

TypeError: ethers.getContract is not a function
at Context. (test/staging/FundMe.staging.test.js:17:31)
at processTicksAndRejections (node:internal/process/task_queues:95:5)

Code (FundMe.staging.test.js):

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

developmentChains.includes(network.name)
? describe.skip
: describe("FundMe", async function () {
let fundMe;
let deployer;
const sendValue = "100000000000000000";
let MockV3Aggregator;

  beforeEach(async function () {
    deployer = (await getNamedAccounts()).deployer;

    fundMe = await ethers.getContract("FundMe", deployer);
  });
  it("allows people to fund and withdraw", async function () {
    const fundTxResponse = await fundMe.fund({ value: sendValue });
    await fundTxResponse.wait(1);
    const withdrawTxResponse = await fundMe.withdraw();
    await withdrawTxResponse.wait(1);

    const endingFundMeBalance = await fundMe.provider.getBalance(
      fundMe.address
    );
    console.log(
      endingFundMeBalance.toString() +
        " should equal 0, running assert equal..."
    );

    assert.equal(endingBalance.toString(), "0");
  });
});

[MTD26]

Hey bro, thank you for your help. I managed to solve it by reinstalling dependencies and recopy-pasting the hardhat.config.js. Must have been a problem related to version, as you mentioned. Thank you

[SimSimButDifferent]

Please mark the discussion as answered.

No worries we have all been there :)

Take care.

[YashGolani]

@SimSimButDifferent, why should we downgrade the dependency from 6.x to 5.x.
This isn't the ideal solution.

[YashGolani]

@MTD26, for version 6.x try to add
deployer = (await getNamedAccounts()).deployer;

[liukaimxy]

if your ethers.js version is 6.x and you got this error: UNSUPPORTED_OPERATION
You can refer to this answer:
https://stackoverflow.com/questions/76137839/error-contract-runner-does-not-support-calling-operation-call-code-unsuppor