Error: child data too short (code=BUFFER_OVERRUN, version=rlp/5.6.0)

[GiraeffleAeffle]

Hello I'm trying to call the mint function of a contract with the sendTransaction function, but I'm getting Error: child data too short (code=BUFFER_OVERRUN, version=rlp/5.6.0). Unfortunately I didn't get to any answer yet.

Do you know what could be the problem?

const { StaticCeloProvider, CeloWallet } = require("@celo-tools/celo-ethers-wrapper");
const provider = new StaticCeloProvider("https://alfajores-forno.celo-testnet.org");
const packAddress = require("../ContractAddresses/contractAddresses.json").packAddress;
const { ethers } = require("ethers");
const pack = require("../artifacts/contracts/RandomPack.sol/Pack.json");
require('dotenv').config({path: '../.env'});

(async() => {
    const ABI = ["function mint( uint256 amount, bytes memory data)"];

    
    const iface = new ethers.utils.Interface(ABI);
    const txData = iface.encodeFunctionData("mint", [1, "0x0000"]);
    console.log("txData: ", txData);
    const gasPrice = await provider.getGasPrice();
    const deployer = new CeloWallet(String(process.env.PRIVATE_KEY_DEPLOYER), provider);
    const contract = new ethers.Contract(packAddress, pack.abi, deployer);
    const tx = await contract.populateTransaction.mint(1, "0x0000", { from: deployer.address , value: "0x5AF3107A4000", gasLimit: "0x1000000", gasPrice: gasPrice});
    console.log("tx: ", tx);
    console.log("tx.data: ", tx.data);

    const signedTx = await deployer.signMessage(JSON.stringify(tx));
    console.log(signedTx);
    await provider.sendTransaction(signedTx);
})()

[zemse]

I think there is a problem in this part of the code:

const signedTx = await deployer.signMessage(JSON.stringify(tx));
console.log(signedTx);
await provider.sendTransaction(signedTx);

You should instead do this:

const signedTx = await deployer.signTransaction(tx);
console.log(signedTx);
await provider.sendTransaction(signedTx);

[GiraeffleAeffle]

Oh, thanks a lot! I completely oversaw this.

Now the error is solved, but I have a different one that I don't really get what is wrong:

Error: invalid address (argument="address", value="0x5af3107a4000", code=INVALID_ARGUMENT, version=address/5.6.0)

this is the abi for the mint function:

{
"inputs": [
{
"internalType": "uint256",
"name": "amount",
"type": "uint256"
},
{
"internalType": "bytes",
"name": "data",
"type": "bytes"
}
],
"name": "mint",
"outputs": [],
"stateMutability": "payable",
"type": "function"
}

I don't even pass an address argument and why is my value key in the error message?