How to create a Solana nonce account for a multisig wallet using Kotlin

[aminsato]

Hey there! So, I've been trying to create a nonce account in Solana using Kotlin code. The catch is, I want to implement this for a multi-signature wallet, but I don't have access to the private keys. When I run the code, I get this error:
Error processing Instruction 1: custom program error: 0x0
Can you help me out with this?

import wallet.core.jni.AnyAddress
import wallet.core.jni.CoinType
import wallet.core.jni.DataVector
import wallet.core.jni.PublicKey
import wallet.core.jni.PublicKeyType
import wallet.core.jni.SolanaAddress
private fun getPreSignedInputData(keysignPayload: KeysignPayload): ByteArray {

        val solanaSpecific = keysignPayload.blockChainSpecific as? BlockChainSpecific.Solana
            ?: error("Invalid blockChainSpecific")
        if (keysignPayload.coin.chain != Chain.Solana) {
            error("Chain is not Solana")
        }
//        val toAddress = AnyAddress(keysignPayload.toAddress, coinType)


        // Get rent-exempt amount for nonce account (80 bytes)
        val rentExemptAmount = getRentExemptAmount() // You'll need to implement this function

        //create bytestring and set 80

        val input = Solana.SigningInput.newBuilder()
            .setRecentBlockhash(solanaSpecific.recentBlockHash)
            .setSender(keysignPayload.coin.address)
            .setPriorityFeePrice(
                Solana.PriorityFeePrice.newBuilder()
                    .setPrice(solanaSpecific.priorityFee.toLong())
                    .build()
            )
            .setCreateNonceAccount(
                Solana.CreateNonceAccount.newBuilder()
                    .setNonceAccount(keysignPayload.coin.address) // The multisig address to upgrade
                    .setNonceAccountBytes(ByteString.copyFromUtf8("80"))//                    .setAuthority(keysignPayload.coin.address)    // The multisig will be the authority
                    .setRent(rentExemptAmount)        // Rent exempt amount for 80 bytes
                    // Don't set nonceAccountPrivateKey since it's a multisig
                    .build()
            )
            .build()

        return input.toByteArray()
    }