NullPointerException when scanning subnet devices for Android Tv

[IbrohimDev]

override suspend fun getDevicesInLan(ipAddress: String): Flow<DeviceData> =
    callbackFlow {
        val subNetDevices = SubnetDevices.fromLocalAddress()
            .findDevices(object : SubnetDevices.OnSubnetDeviceFound {
                override fun onDeviceFound(device: Device?) {
               
                }
                override fun onFinished(devicesFound: java.util.ArrayList<Device>?) {
               
                }
            })
        awaitClose { subNetDevices.cancel() }
    }
    
    I got the error when running this code and it conveys me 
     java.lang.NullPointerException: Attempt to invoke interface method 'boolean java.util.Enumeration.hasMoreElements()' on a null object reference
     
     this one.