how to sign btc?

[s749312025]

result：

{
    error =     {
        code = "-26";
        message = scriptpubkey;
    };
    id = 1;
    result = "<null>";
}

code:

// address: 1.........
let utxo = BitcoinUnspentTransaction.with {
      $0.outPoint.hash = Data(utxoTxid.reversed())
      $0.outPoint.index = index
      $0.outPoint.sequence = UINT32_MAX
      $0.amount = amount
      $0.script = BitcoinScript.lockScriptForAddress(address: vinDic["address"] as! String, coin: .bitcoin).data
  }
  
  let input = BitcoinSigningInput.with {
      $0.hashType = BitcoinSigHashType.all.rawValue | BitcoinSigHashType.fork.rawValue
      $0.amount = Int64(amountString.intValue)
      $0.byteFee = 1
      $0.toAddress = toAddress
      $0.utxo = [utxo]
      $0.privateKey = [pk.data]
  }
  
  let output : BitcoinSigningOutput = AnySigner.sign(input: input, coin: .bitcoin)

// and send output

Is there something missing???

[optout21]

The input scripts field is not set, redeem script should be added, see
https://github.com/trustwallet/wallet-core/blob/master/swift/Tests/Blockchains/BitcoinTests.swift#L84
https://github.com/trustwallet/wallet-core/blob/master/tests/Bitcoin/TWBitcoinSigningTests.cpp#L1159
Also, changeAddress seems to be missing.