Kotlin+RXJava

Why am i getting Unresolved reference: fromCallable in koltin?

for example: compositeDisposable.add(Observable.fromCallable{appDatabase?.registerDao()?.insertAll(registerEntity)})
Here i am getting Unresolved reference: fromCallable.

Hello. This might be a type inference bug or something similar. Can you please submit an issue at http://kotl.in/issue with a self-contained code sample (project) to reproduce the problem? Thanks!