No top-level getter <className> declared

Question

I am expanding on the flutter_gallery example.

I try to create new Gallery Item

new GalleryItem(
  title: 'Journal',
  subtitle: 'Example app coding',
  category: 'Apps',
  routeName: JournalDemo.routeName,
  buildRoute: (BuildContext context) => new JournalDemo()
),

and I imported import '../journal/journal_all.dart';

Inside I have export 'journal_demo.dart';

JournalDemo class is the same class as ListDemo, I only changed the class name and state name:

class JournalDemo extends StatefulWidget {
  JournalDemo({ Key key }) : super(key: key);

  static const String routeName = '/journal';

  @override
  JournalDemoState createState() => new JournalDemoState();
} 

class JournalDemoState extends State<JournalDemo> {
 .......

This is the exception I get

I/flutter : ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ I/flutter : The following NoSuchMethodError was thrown building GalleryApp(dirty; state: I/flutter : GalleryAppState(48280642)): I/flutter : No top-level getter 'JournalDemo' declared. I/flutter : NoSuchMethodError: method not found: 'JournalDemo' I/flutter : Receiver: top-level I/flutter : Arguments: [...] I/flutter : When the exception was thrown, this was the stack: I/flutter : #0 NoSuchMethodError._throwNew (dart:core-patch/errors_patch.dart:184) I/flutter : #1 kAllGalleryItems (/Users/matej/IdeaProjects/flutter/journal/lib/gallery/item.dart:51) I/flutter : #2 kAllGalleryItems (/Users/matej/IdeaProjects/flutter/journal/lib/gallery/item.dart:45)

What should I change?

Thank you

Solution

This looks like you have either a missing import or a parse error in your code. I would recommend checking with flutter analyze as one of the posters above suggests.

No top-level getter 'JournalDemo' declared means that it cannot find the value JournalDemo in the global scope. Either because it's not imported, or because there is a parse error before this error.