No such file or directory in conf_configure()

I am creating an application for free audio and video calling using baresip, I have created demo and its working fine in Swift 4.2 , Now same thing I am applying in my existing project and its give me strange behaviour, existing project is in Swift 3.0, below is my code.

 `   override func viewDidLoad() {
      super.viewDidLoad()

    guard libre_init() == 0 else { return }

    // Initialize dynamic modules
    mod_init()

    // make configure file

    if let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {
        conf_path_set(path)
    }

    guard conf_configure() == 0 else { return }

    guard baresip_init(conf_config(), 0) == 0 else { return }

    //Initialize the SIP Account

    guard ua_init("SIP",1,1,1,0) == 0 else { return }

    // Load Modules

    guard conf_modules() == 0 else { return }

    let addr = "sip:101@ssss.com;auth_pass=IB5zbrzi;transport=upd;answermode=manual;audio_codecs=PCMU/8000/1;audio_codecs=PCMA/8000/1"

    // Start user agent.
    guard ua_alloc(&agent, addr) == 0 else { return }

    let registered = ua_isregistered(agent)
    if registered == 0 {
        print("USER 101@magnates.siptpna.com REGISTERED!!!!!")
    } else {
        print("USER REGISTERATION FAILED!!!")
    }

    uag_event_register({ (agent, event, call, param, arg) in
        print("User Agent \(event)")
    }, nil)

    call_set_handlers(ua_call(agent), { (call, call_event, str, arg) in
        print("Call event: ")
        print(call_event)

        if call_event.rawValue == 0 {
            print("Incomming call from \(str): \(arg)")
        }

        if call_event.rawValue == 4 {
            //                re_cancel()
            ua_hangup(call_get_ua(call), call, 0, "Call Disconnected By peer")
        }
    }, { (call, key, arg) in
        //            print(call)
        //            print(key)
        //            print(arg)
    }, nil)

    // Start the main loop.
    DispatchQueue.global(qos: .userInitiated).async {
        re_main(nil)
    }
}`

 `///////Out put in NSLog

  Printing description of path: "/var/mobile/Containers/Data/Application/904E1C0B-EEC4.    -4642-B61A-079A9FBC5D92/Documents" 
   config: creating config template UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUA\247cء!/config 

  [31mconfig: writing UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUA\247cء!/config: No such file or      directory`

baresip / baresip-ios

No such file or directory in conf_configure() #23