part_of_non_part

The included part '{0}' must have a part-of directive.

The analyzer produces this diagnostic when a part directive is found and the referenced file doesn't have a part-of directive.

Given a file a.dart containing:

class A {}

The following code produces this diagnostic because a.dart doesn't contain a part-of directive:

part 'a.dart';

If the referenced file is intended to be a part of another library, then add a part-of directive to the file:

part of 'test.dart';

class A {}

If the referenced file is intended to be a library, then replace the part directive with an import directive:

import 'a.dart';

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