Navaron Bracke

add controller already initialized error code

import 'package:mobile_scanner/src/mobile_scanner_controller.dart';
/// This enum defines the different error codes for the mobile scanner.
enum MobileScannerErrorCode {
/// The controller was already started.
///
/// The controller should be stopped using [MobileScannerController.stop],
/// before restarting it.
controllerAlreadyInitialized,
/// The controller was used
/// while it was not yet initialized using [MobileScannerController.start].
controllerUninitialized,
... ...