Flutter: A value of type 'ListTileThemeData' can't be assigned to a variable of type 'ListTileTheme'

Turns out this error was caused by a popular library I used (settings_ui) that does not work with this version of Flutter (settings_ui: ^1.0.0).

For future readers: Use a later version of this package. There is currently an open issue on github that addresses this.

Update 2022: Dev on settings_ui seems to have gone AWOL and no longer merging PR's the community has forked this project to: https://pub.dev/packages/flutter_settings_ui and here updates are properly merged and a fix has been released in version 1.0.1

For people facing this issue now:

As a monkey patch you can follow the steps in the GitHub issue and edit the package files locally:

In cupertino_settings_item.dart change final ListTileTheme tileTheme = ListTileTheme.of(context); to final tileTheme = ListTileTheme.of(context);

And change _iconColor(ThemeData theme, ListTileTheme tileTheme) to _iconColor(ThemeData theme, ListTileThemeData tileTheme).

Update flutter_settings_ui: ^2.0.1 to latest and save.

import 'package:flutter_settings_ui/flutter_settings_ui.dart';

Save and flutter run solves this issue.