Invalid value: Only valid value is 0: 1 - Flutter - flutter

Question

I am trying to build a list where each item contains an icon on the far side. However, when I try and access the list when more than one item is added I get the error:
Invalid value: Only valid value is 0: 1
Here is the code:
import 'package:flutter/material.dart';
import './images.dart';
class LikedList extends StatefulWidget {
#override
_LikedListState createState() => _LikedListState();
}
class _LikedListState extends State<LikedList> {
static List<bool> _likes = List.filled(ImagesState.likes.length,true);
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Liked List'),
),
body: ListView.separated(
separatorBuilder: (context, index) => Divider(),
itemCount: ImagesState.likes.length,
itemBuilder: (context, index) {
final item = ImagesState.likes[index];
return ListTile(
title: Text(item),
trailing: IconButton(
icon: _likes[index]
? Icon(
Icons.favorite_border,
color: Colors.grey,
)
: Icon(
Icons.favorite,
color: Colors.red,
),
onPressed: () {
setState(() {
print(_likes);
_likes[index] = !_likes[index];
print(_likes);
});
},
),
onLongPress: () {
setState(() {
print(ImagesState.likes[index]);
ImagesState.likes.removeAt(index);
});
},
);
},
),
);
}
}
Does anyone know why this is happening?
Similar suggestions point to itemCount not being set, but I am using that.

Answer 1

You appear to be creating a fixed length list with the statement:
static List<bool> _likes = List.filled(ImagesState.likes.length,true);
That will create a filled fixed length list of length .likes.length, containing values 'true'.
You need to add a third parameter 'growable: true' in your method call to be able to add to the list.