When encountering the error “dart library ‘dart:ui’ is not available on this platform”, it means that you are trying to use a package or feature that is specific to the Flutter framework. The “dart:ui” library is the primary bridge between the Flutter framework and the underlying platform (iOS or Android).
One possible reason for this error message is that you might be trying to run Dart code outside of a Flutter project or context. Flutter provides a set of tools and APIs that allow Dart code to interact with native platform functions, UI elements, and other features unique to each platform. Without Flutter, the “dart:ui” library is not available.
To illustrate this, consider the following code snippet:
// dart:ui package is not available here
import 'dart:ui';
void main() {
// Code...
}
This code will produce the mentioned error if executed outside of a Flutter project. To resolve this issue, make sure that you are running your Dart code within a valid Flutter project or context.
For example, if you have a Flutter project structure like this:
my_project/
lib/
main.dart
pubspec.yaml
You should navigate to the “my_project” directory in your terminal or command prompt and run the command “flutter run” to execute the Dart code within the desired Flutter context.