未为promise调用错误处理程序

我有一个服务,当我输入错误的登录凭据时会失败。但是,我的Promise错误处理程序不会被调用。

我似乎不明白我的代码有什么问题,所以 error 永远不会到达回调。

服务

func loadRepositories() -> Promise<[Repository]>{
    return Promise { fullfill, reject in
        manager.request(Method.GET, baseURL + "/api/1.0/user/repositories")
            .authenticate(user: username, password: password)
            .responseArray { (response: Response<[Repository], NSError>) in
                switch response.result{
                case .Success(let value):
                    fullfill(value)
                case .Failure(let e):
                    // The breakpoint here is reached.
                    reject(e)
                }
        }
    }
}

搬运

firstly{
    service!.loadRepositories()
}.then { repositories -> Void in
    loginVC.dismissViewControllerAnimated(true, completion: nil)
    self.onLoginSuccessful()
}.always{
    // Always gets called 
    loginVC.isSigningIn = false
}.error { error in
    // I never get here even though `reject(e)` is called from the service.
    loginVC.errorString = "Login went wrong"
}