RxSwift Book: Error error

[prenez01]

Chapter 2 - Type 'Result<String, Error>' has no member 'error'

I got the error when using single, like the code below. guard let path = Bundle.main.path(forResource: name, ofType: “txt”) else { single(.error(FileReadError.fileNotFound)) return disposable } The error message from compiler is → Type ‘Result<String, Error>’ has no member ‘error’ Can somebody tell me how to solve this problem?

This error still exists in 4th edition epub. Cost me an hour.