Getting error while trying to send transaction "Failed to fetch nonce"

[k1ran-ak]

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Previously I was getting error mentioned in https://github.com/skywinder/web3swift/issues/254 after that when I tried to run I'm getting -> processingError(desc: "Failed to fetch nonce")

    let value: String = value
    let walletAddress = EthereumAddress(walletAddress)!
    let toAddress = EthereumAddress(toAddress)!
    let endpoint = URL(string: "https://ropsten.infura.io/v3/fa38f7a943ae4c02a407220a4d442f5f")!
    do {
    let web3 = try Web3.new(endpoint)
    web3.addKeystoreManager(KeystoreManager([globalKeystore]))
    let contract = web3.contract(Web3.Utils.coldWalletABI, at: toAddress, abiVersion: 2)!
    let amount = Web3.Utils.parseToBigUInt(value, units: .eth)
    var options = TransactionOptions.defaultOptions
    options.value = amount
    options.from = walletAddress
    options.gasPrice = .automatic
    options.gasLimit = .automatic
    let tx = contract.write(
    "fallback",
    parameters: [AnyObject](),
    extraData: Data(),
    transactionOptions: options)!
    let mainTransaction = try tx.send(password: password)
    print(mainTransaction.hash, "hash of transaction")
    } catch {
        print(error)
    }

// Any help would be appreciated as I'm new to this repo.

[mloit]

is this still an issue as of 2.6.3? Is the sending address new, or has it made previous transactions?

[k1ran-ak]

Yes its an issue as of 2.6.3. The sending account has only one transaction in which it was received some ETH.

[mloit]

have you tried with the built-in Infura provider? let web3 = InfuraRopstenWeb3() Also have you validated that walletAddress and your other input parameters are what you expect. Try adding print(tx.transactionOptions) before the line where you call tx.send() to make sure.

[k1ran-ak]

Yes I have validated my walletAddress and other input parameters. Thanks for the input, I have made changed to my code based on your inputs but now I get

inputError(desc: "Failed to locally sign a transaction")

as error.

[mloit]

I suspect your keystore/wallet is not set up correctly then. If you saw a change in behavior between the built-in provider and your original URL, there must be something wrong with your key, and it was resulting in the nonce error, because the node rejected your request.

[k1ran-ak]

I followed as per https://github.com/skywinder/web3swift/issues/285 and let walletAddress = manager.addresses?.first?.address I used this walletAddress to get ETH balance using https://api-ropsten.etherscan.io/api?module=account&action=txlist&address=walletAddress... which works completely fine. This is the same walletAddress I'm sending from. so I don't think the problem is with wallet address or Keystore. The url I used from infura is the same as they provided. Even when I used built-in provider as let web3 = Web3.InfuraRopstenWeb3() it throws the same error.

inputError(desc: "Failed to locally sign a transaction")

[mloit]

"Failed to locally sign a transaction" is an indicator that the public/private key pair don't match up. (hence my earlier comment about the wallet not being set-up correctly)

To elaborate: when web3swiftsigns a transaction, it attempts to recover the public address from the signature to verify. The error you see is what you get when that verification fails.

[k1ran-ak]

I tried with different wallet address and private key. Still the issue exists. Can you share a sample code on how to get the private key ? I used the following

func importWalletWith(privateKey: String){
       let formattedKey = privateKey.trimmingCharacters(in: .whitespacesAndNewlines)
       guard let dataKey = Data.fromHex(formattedKey) else {
           self.showAlertMessage(title: "Error", message: "Please enter a valid Private key ", actionName: "Ok")
           return
       }
       do {
           let keystore =  try EthereumKeystoreV3(privateKey: dataKey)
         
           if let myWeb3KeyStore = keystore {
               let manager = KeystoreManager([myWeb3KeyStore])
               globalKeystore = myWeb3KeyStore
               let address = keystore?.addresses?.first
#if DEBUG
               print("Address :::>>>>> ", address as Any)
               print("Address :::>>>>> ", manager.addresses as Any)
#endif
               let walletAddress = manager.addresses?.first?.address
//                self.walletAddressTF.text = walletAddress ?? "0x"
               let vc = instantiateVC(identifier: "WalletDetailsVC") as! WalletDetailsVC
               vc.walletAddress = walletAddress ?? "0x"
               self.navigationController?.pushViewController(vc, animated: true)
               print(walletAddress as Any)
           } else {
               print("error")
           }
       } catch {
#if DEBUG
           print("error creating keyStrore")
           print("Private key error.")
#endif
           let alert = UIAlertController(title: "Error", message: "Please enter correct Private key", preferredStyle: .alert)
           let okAction = UIAlertAction(title: "OK", style: .destructive)
           alert.addAction(okAction)
           self.present(alert, animated: true)
       }