Error when interacting with FundMe contract with Web3 ValueError: {'code': -32016, 'data': 'Reverted', 'message': 'The execution failed due to an exception.'}

[ptn77]

I deployed my Fund_me smart contract on Kovan testnet and I tried to call the withdraw function on it using web3, but I'm getting the error ValueError: {'code': -32016, 'data': 'Reverted', 'message': 'The execution failed due to an exception.'}. How can I troubleshoot this or get a more detailed error of what's wrong? Here's the contract withdraw method:

 modifier onlyOwner() {
    require(msg.sender == owner);
    _;
}

function withdraw() public payable onlyOwner {
    msg.sender.transfer(address(this).balance);

    for (
        uint256 funderIndex = 0;
        funderIndex < funders.length;
        funderIndex++
    ) {
        address funder = funders[funderIndex];
        addressToAmountFunded[funder] = 0;
    }
    funders = new address[](0);
}

Here's the web3 code to invoke the withdraw method on the contract:

web3 = Web3(
    Web3.HTTPProvider("https://kovan.infura.io/v3/a7cfd54a6f5147449c622316ea15a4ba")
)
abi = '[{"inputs":[{"internalType":"address","name":"_priceFeed","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"addressToAmountFunded","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fund_Catherine","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"funders","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"ethAmount","type":"uint256"}],"name":"getConversionRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getEntranceFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVersion","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceFeed","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"payable","type":"function"}]'
addr = "0xAAa9F30a71456aFB436dDF49BaA12952F5116017"
modelcontract = web3.eth.contract(address=addr, abi=abi)
tx = modelcontract.functions.withdraw().buildTransaction()
tx.update({"from": str(account)})
tx.update({"to": addr})
tx.update({"gas": 21000})
tx.update({"gasPrice": 2})
nonce = web3.eth.get_transaction_count(str(account))
print(nonce)
tx.update({"nonce": nonce})
signed_message = web3.eth.account.sign_message(
    tx, private_key=config["wallets"]["from_key"]
tx_hash = web3.eth.send_raw_transaction(signed_message.rawTransaction)
tx_receipt = web3.eth.wait_for_transaction_receipt(tx_hash, 180)

[Noveleader]

Hey @ptn77 I hope you're deploying the right contract, try changing this msg.sender.transfer(address(this).balance); to
payable(msg.sender).transfer(address(this).balance);

[ptn77]

Hi @Noveleader Thank you for responding. The contract is working because I tried it directly on etherscan and the ether amount gets deposited into my wallet correctly. I think there's an issue with the web3 client code.
Directly on the kovan etherscan: https://kovan.etherscan.io/address/0xaaa9f30a71456afb436ddf49baa12952f5116017#writeContract

[Noveleader]

ohh great

[cromewar]

Hello @ptn77
Why your Abi is that big?

[cromewar]

Try sending the gasprice on the transacction

[ptn77]

Yes, I tried that and I'm getting a new error now.
Here's the updated code:

web3 = Web3(
        Web3.HTTPProvider("https://kovan.infura.io/v3/a7cfd54a6f5147449c622316ea15a4ba")
    )
    abi = '[{"inputs":[{"internalType":"address","name":"_priceFeed","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"addressToAmountFunded","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fund_Catherine","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"funders","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"ethAmount","type":"uint256"}],"name":"getConversionRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getEntranceFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVersion","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceFeed","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"payable","type":"function"}]'
    addr = "0xAAa9F30a71456aFB436dDF49BaA12952F5116017"

    modelcontract = web3.eth.contract(address=addr, abi=abi)
    print("Model contract: " + str(modelcontract.functions.getEntranceFee().call()))
    nonce = web3.eth.get_transaction_count(str(account))
    print("nonce" + str(nonce))

    tx = modelcontract.functions.withdraw().buildTransaction(
        {
            "chainId": 42,
            "gas": 21000,
            "gasPrice": Web3.toWei(2, "gwei"),
            "from": str(account),
            "nonce": nonce,
        }`

Model contract getEntranceFee: 14257525121759265
nonce 47

and here's the new error:

{'value': 0, 'chainId': 42, 'gas': 21000, 'gasPrice': 2000000000, 'from': '0xEB6dF80433b81fD866E67Ef5B13bb9A283cb46B9', 'nonce': 47, 'to': '0xAAa9F30a71456aFB436dDF49BaA12952F5116017', 'data': '0x3ccfd60b'}
File "brownie/_cli/run.py", line 49, in main
return_value, frame = run(
File "brownie/project/scripts.py", line 103, in run
return_value = f_locals[method_name](*args, **kwargs)
File "./scripts/fund_and_withdraw.py", line 78, in main
withdraw()
File "./scripts/fund_and_withdraw.py", line 63, in withdraw
signed_message = web3.eth.account.sign_message(
File "eth_utils/decorators.py", line 18, in _wrapper
return self.method(obj, *args, **kwargs)
File "eth_account/account.py", line 558, in sign_message
message_hash = _hash_eip191_message(signable_message)
File "eth_account/messages.py", line 63, in _hash_eip191_message
version = signable_message.version
AttributeError: 'dict' object has no attribute 'version'

[cromewar]

This one is tricky as the eth_account actually has a version type

I think this could be due to a indentation error on your code, but not sure, I'll try to do more research on this.

[ptn77]

I think you are right about the indentation. I just re-wrote the code to remove indents:

key = config["wallets"]["from_key"]

sign the transaction:

signed_message = w3.eth.account.sign_transaction(tx, private_key=key)

Now it's working and it's just complaining about running out of gas now.

thanks for your help

[cromewar]

I'm glad is solved now.

[ptn77]

I have many functions 😆

…

On Sun, Apr 3, 2022, 11:27 PM Vasiliy Gualoto ***@***.***> wrote: Hello @ptn77 <https://github.com/ptn77> Why your Abi is that big? — Reply to this email directly, view it on GitHub <#1367 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB63TJMEPS2T6HXMJNMFR73VDJ4TDANCNFSM5SOF7OVA> . You are receiving this because you were mentioned.Message ID: <smartcontractkit/full-blockchain-solidity-course-py/repo-discussions/1367/comments/2497613 @github.com>