I can build & run my Winui3 Packaged app however when I try to publish & create an App Package msix file I get the below error, I have 3 projects in my solutions a) Main app project - WinUI3, b) App Package Project, c) Winui3 Class Library, the Class Library is a dependency of the Main Winui App Product & has a Project Reference added.

1>------ Publish started: Project: GDPointsDataApp2 (Package), Configuration: Release x64 ------
1>Determining projects to restore...
1>All projects are up-to-date for restore.
1>Could not find project item with item type 'ProjectReference' and include value '..\..\PointsJTimeLibrary\PointsJTimeLibrary.csproj'.
========== Publish: 0 succeeded, 1 failed, 0 skipped ==========
========== Publish completed at 20:27 and took 02.784 seconds ==========
========== Package: 0 succeeded, 1 failed ===========