aptos-unity-sdk: ArgumentNullException in CreateBCSSignedTransaction

[0xBoji]

Discord user ID

pichtranst123

Describe your question in detail.

I'm encountering an ArgumentNullException error while trying to call the CreateBCSSignedTransaction method using the Aptos Unity SDK. The error message indicates that a value cannot be null, specifically the array parameter in https://github.com/aptos-labs/Aptos-Unity-SDK.
I trynna print the parameter and make sure that correct in smartcontract

What error, if any, are you getting?

transactionArguments with payload are still ok but CreateBCSSignedTransaction still has null argument
or is it because of signedTransaction?

What have you tried or looked at? Or how can we reproduce the error?

Smartcontract param:

Error log:

Which operating system are you using?

Windows

Which SDK or tool are you using? (if any)

Unity SDK

Describe your environment or tooling in detail

No response