Unable to generate extensions Pair

[Egi10]

version moko-kswift : 0.6.1

I have 2 extensions like this:

fun Pair<String, List<String>>.asDomain(): String {
    return "Me"
}

fun Pair<String, String>.asDomainString(): String {
    return "Me"
}

When in XCode an error like this occurs: Extension of a generic Objective-C class cannot access the class's generic parameters at runtime