Hỏi về convert Java sang Kotlin

Mình đang có 1 đoạn code Java

  public <R> Observable<?> adapt(Call<R> call) {
            return ((Observable) wrapped.adapt(call))
                    .onErrorResumeNext(new Func1<Throwable, Observable>() {
                        @Override
                        public Observable call(Throwable throwable) {
                            throwable.printStackTrace();
                            return Observable.error(asRetrofitException(throwable));
                        }
                    });
        }

Sau khi dùng Android Studio chuyển sang Kotlin thì mình được đoạn code

  override fun <R> adapt(call: Call<R>): Observable<*> {
            return (wrapped.adapt(call) as Observable<*>)
                    .onErrorResumeNext(Func1<Throwable, Observable<*>> { throwable ->
                        throwable.printStackTrace()
                        Observable.error(asRetrofitException(throwable))
                    })
        }

Nhưng nó đang báo lỗi ở onErrorResumeNext và Observable.error cụ thể:

• onErrorResumeNext

Error:(36, 22) None of the following functions can be called with the arguments supplied:
public final fun onErrorResumeNext(p0: ((Throwable!) -> Observable<out Nothing!>!)!): Observable<out Any!>! defined in rx.Observable
public final fun onErrorResumeNext(p0: Observable<out Nothing!>!): Observable<out Any!>! defined in rx.Observable
public final fun onErrorResumeNext(p0: Func1<Throwable!, out Observable<out Nothing!>!>!): Observable<out Any!>! defined in rx.Observable

• Observable.error

Error:(38, 36) Type inference failed: Not enough information to infer parameter T in fun <T : Any!> error(p0: Throwable!): Observable<T!>!
Please specify it explicitly.

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