Invalid argument (Object of type RegisterModel is not registered inside GetIt.

[MuhammamdArslanKhan]

I have registered my model but it still says "RegisterModel is not registered inside GetIt"

Here is my View class

class RegistrationView extends StatefulWidget {

  @override
  _RegistrationViewState createState() => _RegistrationViewState();
}

class _RegistrationViewState extends State<RegistrationView> {
  
  @override
  Widget build(BuildContext context) {

    return BaseView<RegisterModel>(
        builder: (context, model, child) => Scaffold(
          
          body:Container()
      ),
    );
    // TODO: implement build
  }
}

Here is View Model

class RegisterModel extends BaseModel {
  final AuthenticationService _authenticationService = locator<AuthenticationService>();

  String errorMessage;

  Future<bool> register(String userIdText) async {
    setState(ViewState.Busy);
    var userId = int.tryParse(userIdText);

    // Not a number
    if(userId == null) {
      errorMessage = 'Value entered is not a number';
      setState(ViewState.Idle);
      return false;
    }

    var success = await _authenticationService.register(userId);

    // Handle potential error here too.

    setState(ViewState.Idle);
    return success;
  }
}

Here is locator

GetIt locator = GetIt.instance;

void setupLocator() {

  locator.registerLazySingleton(() => AuthenticationService());
  locator.registerLazySingleton(() => Api());
  locator.registerFactory(() => RegisterModel());

}```
My BaseModel class

class BaseModel extends ChangeNotifier {
ViewState _state = ViewState.Idle;

ViewState get state => _state;

void setState(ViewState viewState) {
_state = viewState;
notifyListeners();
}
}

And Here is issue

> 
is not registered inside GetIt
I/flutter (19507): _RegistrationViewState#1f05d):
I/flutter (19507): Invalid argument (Object of type RegisterModel is not registered inside GetIt.
I/flutter (19507):  Did you forget to pass an instance name?
I/flutter (19507): (Did you accidentally do  GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;)):
I/flutter (19507): RegisterModel
I/flutter (19507):
I/flutter (19507): When the exception was thrown, this was the stack:
I/flutter (19507): #0      GetIt.get 
package:get_it/get_it.dart:76
I/flutter (19507): #1      GetIt.call 
package:get_it/get_it.dart:87
I/flutter (19507): #2      new _BaseViewState 
package:mokoo_dog/…/views/base_view.dart:18
I/flutter (19507): #3      BaseView.createState 
package:mokoo_dog/…/views/base_view.dart:14
I/flutter (19507): #4      new StatefulElement 
package:flutter/…/widgets/framework.dart:3989
I/flutter (19507): #5      StatefulWidget.createElement 
package:flutter/…/widgets/framework.dart:802
I/flutter (19507): #6      Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3082
I/flutter (19507): #7      Element.updateChild 
package:flutter/…/widgets/framework.dart:2887
I/flutter (19507): #8      ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:3935
I/flutter (19507): #9      Element.rebuild 
package:flutter/…/widgets/framework.dart:3721
I/flutter (19507): #10     ComponentElement._firstBuild 
package:flutter/…/widgets/framework.dart:3907
I/flutter (19507): #11     StatefulElement._firstBuild 
package:flutter/…/widgets/framework.dart:4053
I/flutter (19507): #12     ComponentElement.mount 
package:flutter/…/widgets/framework.dart:3902
I/flutter (19507): #13     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3084
I/flutter (19507): #14     Element.updateChild 
package:flutter/…/widgets/framework.dart:2887
I/flutter (19507): #15     SingleChildRenderObjectElement.mount 
package:flutter/…/widgets/framework.dart:5092
I/flutter (19507): #16     Element.inflateWidget 
package:flutter/…/widgets/framework.dart:3084
I/flutter (19507): #17     Element.updateChild 
package:flutter/…/widgets/framework.dart:2887
I/flutter (19507): #18     ComponentElement.performRebuild 
package:flutter/…/widgets/framework.dart:3935
I/flutter (19507): #19     Element.rebuild 
package:flutter/…/widgets/framework.dart:3721
I/flutter (19507): #20     ComponentElement._firstBuild 
package:flutter/…/widgets/framework.dart:3907
I/flutter (19507): #21     ComponentElement.mount 

[MuhammamdArslanKhan]

I think this error is misguiding us "Invalid argument (Object of type RegisterModel is not registered inside GetIt. " and the error should be that you are missing to register(I am not sure what we say when we include in the main function) locator in the main function
I followed the written tutorial and video as well there was one thing missing that we need to include setupLocator(); in the main function.
in the get_it package description, it is also missing.

void main() {
  setupLocator();   // I was missing setupLocator to regiter in then main function
  runApp(MyApp());
}

[escamoteur]

Error message will be improved in V4.0.0

[pradyuman98]

Error message will be improved in V4.0.0

Damn you saved my life.........Thanks man