part_of_different_library

Expected this library to be part of '{0}', not '{1}'.

The analyzer produces this diagnostic when a library attempts to include a file as a part of itself when the other file is a part of a different library.

Given a file part.dart containing

part of 'library.dart';

The following code, in any file other than library.dart, produces this diagnostic because it attempts to include part.dart as a part of itself when part.dart is a part of a different library:

part 'package:a/part.dart';

If the library should be using a different file as a part, then change the URI in the part directive to be the URI of the other file.

If the part file should be a part of this library, then update the URI (or library name) in the part-of directive to be the URI (or name) of the correct library.