Script error

[TheCarpetMerchant]

What happened?

Script error.
Based on Flutter 3.7.12 Dart SDK 2.19.6

Steps to reproduce problem

See code

Additional info

Browser

Browser: Brave

Version: Version 1.51.110 Chromium: 113.0.5672.77 (Official Build) (64-bit)

Are you using any extensions/plugins that affect website behavior
(particularly those that affect iframes, such as ad blockers)?

Are there any warnings or errors in your browser's JavaScript console?
If so, paste them below:

dartpad.dev-1683713703099.log

Machine

Operating system: Windows 10 64 bits

Version:

Your code

What code was in the editor, if any, when the failure occurred? You
can paste it in below:

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Title'),
        ),
        body: TestWidget(),
      ),
    );
  }
}

class TestWidget extends StatelessWidget {
  const TestWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Row(
          children: [
            ListView(
              children: [
                for(int i = 1; i < 20; i++)
                  ListTile(
                    title: Text('Item $i'),
                    onTap: () async {
                      ScaffoldMessenger.of(context).showSnackBar(
                        SnackBar(
                          content: Text("label"),
                        ),
                      );
                      await Future.delayed(const Duration(seconds: 1));
                      Navigator.pop(context);
                    },
                   ),
              ],
            ),
            IconButton(onPressed: () {}, icon: const Icon(Icons.add)),
          ],
        )
      ],
    );
  }
}

DartPad's output

Did DartPad print anything to the console pane? If so, paste it below:

Script error.

[domesticmouse]

I ran this in a local Flutter dev environment and received the following error:

Vertical viewport was given unbounded height.
Viewports expand in the scrolling direction to fill their container. In this case, a vertical
viewport was given an unlimited amount of vertical space in which to expand. This situation
typically happens when a scrollable widget is nested inside another scrollable widget.
If this widget is always nested in a scrollable widget there is no need to use a viewport because
there will always be enough vertical space for the children. In this case, consider using a Column
or Wrap instead. Otherwise, consider using a CustomScrollView to concatenate arbitrary slivers into
a single scrollable.

The relevant error-causing widget was:
  ListView
  ListView:file:///Users/brettmorgan/Documents/flutter-projects/issue_2514/lib/main.dart:40:13

The updated code, to eliminate linter warnings:

import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Title'),
        ),
        body: const TestWidget(),
      ),
    );
  }
}

class TestWidget extends StatefulWidget {
  const TestWidget({Key? key}) : super(key: key);

  @override
  State<TestWidget> createState() => _TestWidgetState();
}

class _TestWidgetState extends State<TestWidget> {
  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Row(
          children: [
            ListView(
              children: [
                for (int i = 1; i < 20; i++)
                  ListTile(
                    title: Text('Item $i'),
                    onTap: () async {
                      ScaffoldMessenger.of(context).showSnackBar(
                        const SnackBar(
                          content: Text("label"),
                        ),
                      );
                      await Future.delayed(const Duration(seconds: 1));
                      if (!mounted) return;
                      Navigator.pop(context);
                    },
                  ),
              ],
            ),
            IconButton(onPressed: () {}, icon: const Icon(Icons.add)),
          ],
        )
      ],
    );
  }
}

[TheCarpetMerchant]

The correct error should be in the Dartpad output. This shouldn't be closed, not have the exception in Dartpad renders it functionality useless.

[domesticmouse]

Hey @johnpryan do you have a tracking issue for exposing flutter run time issues?

[johnpryan]

This looks like the same issue as #1966