Override Java interface with only getters in Kotlin

I have this interface in Java:

public interface ErrorInfo {
  String getCode();
  String getMessage();
}

And I want it to override in Kotlin code. I can't seem to do it.

Here's what I tried:

Here, I get an error that '<field> overrides nothing'

class ErrorInfoImpl(
  override val code: String,
  override val message: String
) : ErrorInfo

Here, I get the same error '<field> overrides nothing'

class ErrorInfoImpl(
  code: String,
  message: String
) : ErrorInfo {
   override val code: String = code
   override val message: String message
}

This code works, but it looks dirty:

class ErrorInfoImpl(
  private val __code: String,
  private val __message: String
) : ErrorInfo {
    override fun getCode(): String = __code
    override fun getMessage(): String = __message
}

Are there better ways to do this?

The contract is to have getCode() and getMessage() methods only. What it returns is up to implementing class. The cleanest in this case is following:

class ErrorInfoImpl(
  private val code: String,
  private val message: String
) : ErrorInfo {
    override fun getCode(): String = code
    override fun getMessage(): String = message
}