JSON-RPC error on ExecuteContractFunction in unity3d when trying to pass json as an argument

Moralis General
#1

calling ExecuteContractFunction and passing single argument or array of arguments isnt a problem, they work fine.
but when i try to pass a json string as an argument, it throws the following error
Call to MyFunction failed due to: Internal JSON-RPC error.: eth_sendTransaction

code that lets single argument and array of arguments pass through

    HexBigInteger value = new HexBigInteger(0);
    HexBigInteger gas = new HexBigInteger(0);
    HexBigInteger gasPrice = new HexBigInteger(0);

but when i use above values for json argument function, i get JSON-RPC error
so i tried following values

    HexBigInteger value = new HexBigInteger(0);
    HexBigInteger gas = new HexBigInteger(3000000);
    HexBigInteger gasPrice = new HexBigInteger(3000000);

this time on my metamask wallet, the transaction went through, but when i checked on polygonScan, it shows transaction failed.

following code i use to call execute contract function and pass json as an argument

public static async Task<string> ExecuteContractFuction()
{

    newArg neArg = new newArg();
    neArg.testId = 1;
    neArg.testNumber = 210;
    string jsonArg = JsonUtility.ToJson(neArg);
    Debug.Log("zuzu jsonArg = " + jsonArg);
    object[] newArgs =
    {
        jsonArg
    };
    HexBigInteger value = new HexBigInteger(0);
    HexBigInteger gas = new HexBigInteger(0);
    HexBigInteger gasPrice = new HexBigInteger(0);

    string resp = "";

    try
    {
        resp = await Moralis.ExecuteContractFunction(address, abi, TestContract.Function.testFunctionTwo, newArgs, value, gas, gasPrice);
    }
    catch (Exception exception)
    {
        resp = exception.ToString();
    }
    return resp;
}
public class newArg
{
    public int testId, testNumber;
}

following is the log in code above
zuzu jsonArg = {"testId":1,"testNumber":210}

so what am i doing wrong here ?

#2

What is the contract address and ABI you’re using?

code that lets single argument and array of arguments pass through

What previously worked (arguments and function name)?

#3

so function that takes in single argument works

    object[] args =
        {
            1
        };

functions that takes in array of argument works as well

    object[] args =
        {
            1,210
        };

but function that takes in json string as an argument doesnt work

public class newArg
{
    public int testId, testNumber;
}


    newArg neArg = new newArg();
    neArg.testId = 1;
    neArg.testNumber = 210;
    string jsonArg = JsonUtility.ToJson(neArg);

    object[] args =
        {
            jsonArg
        };
#4

Try a test with:

object[] args =
        {
            '{"testId":1,"testNumber":210}'
        };
#5

nope. single inverted coma is throwing error in c#.
error CS1012: Too many characters in character literal

#6

check this out. i updated the question so you can have better understanding.
@alex

#7