getException not importing

https://github.com/kittinunf/fuel/tree/2.x

            when (result) {
                is Result.Failure -> {
                    val ex = result.getException()
                    println(ex)
                }
I can't seem to get getException() when it comes to here; it states it's an unresolved reference.

Please provide some extra context!

Which file it is or function in the lib you shared?