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The error message "Error: Not found: 'dart:js'" usually means that the Dart virtual machine is trying to import the 'dart:js' library but fails because it cannot find it. This error typically occurs when running a Flutter application in an iOS simulator because the 'dart:js' library is only available for web applications, and not for iOS or Android.

To fix this error, you can remove any references to the 'dart:js' library in your code. If you are using a third-party package that relies on the 'dart:js' library, you may need to find an alternative package that does not depend on this library or create a conditional import that only includes the package when running a web application.