What does the error message "Not found: 'dart:js'" mean while running a flutter app on an iOS simulator?

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The error message "Not found: 'dart:js'" means that the Dart compiler is unable to find the 'dart:js' library which is required to run the Flutter app on an iOS simulator. This library is used to interact with JavaScript code in web pages, and it is not available on iOS.

This error can occur if the Flutter code has references to the 'dart:js' library or if a package used in the app requires it.

To fix this error, you will need to remove any references to the 'dart:js' library from your Flutter code and dependencies. You may also need to update your code or dependencies to use alternative libraries that are compatible with iOS.