Raises error: not registered inside GetIt although it is

[ChinaeduO]

Hi,
I am having a problem with the package. Inside of my injector class I am registering all my blocs, datasources etc.:

locator.registerLazySingleton<Dio>(() => Dio());
 locator.registerLazySingleton(() => const FlutterSecureStorage());
 locator.registerLazySingleton<UserRepository>(
   () => UserRepositoryImpl(secureStorageDataSource: locator()),
 );

 locator.registerLazySingleton<KIBackendDatasource>(
     () => KIBackendDatasourceImpl(dio: locator()));

 print('Is registered: ' +
     locator
         .isRegistered(instance: locator<KIBackendDatasource>())
         .toString());

 locator.registerLazySingleton<AuthenticationRepository>(
     () => AuthenticationRepositoryImpl(kiBackendDatasource: locator()));

 locator.registerLazySingleton(() => GetUserDataUseCase(locator()));

 locator.registerLazySingleton(() => AuthenticationBloc(
     authenticationRepository: locator(),
     userRepository: locator(),
     getUserDataUseCase: locator()));

But when running the code the package throws an error that says:

Object/factory with  type KIBackendDatasourceImpl is not registered inside GetIt. 
(Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;
Did you forget to register it?)

I have registered the KIBackendDatasourceImpl. And even if I am checking the registration with:

locator
          .isRegistered(instance: locator<KIBackendDatasource>())

It is returning true.

So is there an issue or am I doing anything wrong here?

[ChinaeduO]

Resolved it. I forgot to register another Data source file. That was causing the issue.