SelectedCategoryPage Error

[MarioCastle]

import 'package:boss111/models/category.dart';
import 'package:boss111/pages/detailspage.dart';
import 'package:boss111/widgets/categoryicon.dart';
import 'package:flutter/material.dart';

import '../../../widgets/mainappbar.dart';

class SelectedCategoryPage extends StatelessWidget {
Category? selectedCategory;
SelectedCategoryPage({this.selectedCategory});

@OverRide
Widget build(BuildContext context) {
return Scaffold(
appBar: MainAppBar(),
body: Container(
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
CategoryIcon(
color: this.selectedCategory!.color!,
iconName: this.selectedCategory!.icon!),
SizedBox(width: 10),
Text(
this.selectedCategory!.name!,
style: TextStyle(
color: this.selectedCategory!.color!, fontSize: 20),
),
],
),
SizedBox(height: 30),
Expanded(
child: GridView.count(
crossAxisCount: 2,
children: List.generate(
this.selectedCategory!.subCategories!.length,
(index) {
return GestureDetector(
onTap: () {
// NAVIGATE to the details page
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => DetailsPage(

                              subCategory:
                              this.selectedCategory!.subCategories![index], <<<<<---------------
                              ),
                        ));
                  },
                  child: Container(
                    child: Column(
                      children: [
                        ClipOval(
                          child: Image.asset(
                              'assets/images/drink/' +
                                  this
                                      .selectedCategory!
                                      .subCategories![index]
                                      .imgName! +
                                  '.png',
                              fit: BoxFit.cover,
                              width: 100,
                              height: 100),
                        ),
                        SizedBox(height: 10),
                        Text(
                          this
                              .selectedCategory!
                              .subCategories![index]
                              .name!,
                          style: TextStyle(
                              color: this.selectedCategory!.color),
                        ),
                      ],
                    ),
                  ),
                );
              },
            ),
          ),
        ),
      ],
    ),
  ),
);

}
}

[MarioCastle]

dont know why keep error ..
i alredy put this ! or ? nulll safe still ..error

[thyagosouza]

dont know why keep error .. i alredy put this ! or ? nulll safe still ..error

the same problem here! =(

[romanejaquez]

hey @thyagosouza @MarioCastle what's the precise error you're getting so I can help? thanks

[thyagosouza]

hey @thyagosouza @MarioCastle what's the precise error you're getting so I can help? thanks

hey master... the problem for this question I found in the other topic .. it was just adding the SubCategory at the end of the code. As is in the image.