web3swift.Web3Error.processingError("Failed to fetch nonce")

[DarcyLau]

When I try to transfer token to another account, why is it always this error
web3swift.Web3Error.processingError("Failed to fetch nonce")

let url = URL.init(string: nodeAddress)
            let web3 = Web3(url: url!)
            let walletAddress = EthereumAddress(fromAddress) // Your wallet address
            let toAddress = EthereumAddress(toAddress)
            let erc20ContractAddress = EthereumAddress(contractAddress)
            let amount = Web3.Utils.parseToBigUInt(amount, units: .eth)
            var options = Web3Options.defaultOptions()
            options.value = amount
            options.from = walletAddress
            options.to = toAddress
            options.gasLimit = try web3?.eth.getBlockNumber()
            options.gasPrice = try web3?.eth.getGasPrice()
            let method = "transfer"
            guard let tokenContract = try web3?.contract(Web3.Utils.erc20ABI, at: erc20ContractAddress) else {
                print("error no created token address")
                return
            }
            let parameters = [toAddress as AnyObject, amount as Any] as [AnyObject]
            let transactionContract = try tokenContract.method(method, parameters: parameters, options: options)
            transactionContract.transaction.nonce = try (web3?.eth.getTransactionCount(address: Address(fromAddress)))!
            let results = try transactionContract.send(password: pass, options: options, onBlock: "")

[skywinder]

Hello. Looks like you didn't send transaction before fetching nonce. Try to switch last 2 strings in your example.

[skywinder]

Feel free to reopen the issue, if you still need help. 👍

[ayjayem]

Hi there,

This seems like a great library - thanks so much for providing!

I am also facing this error: 'Fatal error: 'try!' expression unexpectedly raised an error: Web3swift.Web3Error.processingError(desc: "Failed to fetch nonce").'

I'm sure I'm just doing something silly - any assistance would be very much appreciated:

    let web3 = Web3.InfuraMainnetWeb3()
    let walletAddress = EthereumAddress(wallet!.address!)!

    let contractMethod = "approve"
    let DAIcontractAddress = EthereumAddress(daiAddressString)!
    let abiVersion = 2
    
    let approvalUnits = "1000"
    let approveAmount = Web3.Utils.parseToBigUInt(approvalUnits, units: .wei)!
    
    let approveAddress = EthereumAddress(erc20AddressString)!
    
    let parameters: [AnyObject] = [approveAddress as AnyObject, approveAmount as AnyObject] as [AnyObject]
    let extraData: Data = Data()
    let contract = web3.contract(Web3.Utils.erc20ABI, at: DAIcontractAddress, abiVersion: abiVersion)!
    var options = TransactionOptions.defaultOptions
    options.from = walletAddress
    options.gasPrice = .automatic
    options.gasLimit = .automatic
    let tx = contract.write(
        contractMethod,
        parameters: parameters,
        extraData: extraData,
        transactionOptions: options)!
    
    _ = try! tx.send(password: password)

[skywinder]

@alexandermucalov, sometimes it happens with infura issues. Ping me in the telegram, we can debug it, and I can provide you more support with this!