Hey, Attempting to upgrade our 13 project to 15. Apart from a few packages that haven't been upgraded it's going ok, except can't get past this error: NU1608      Detected package version outside of dependency constraint: Umbraco.Cms.Web.BackOffice 13.0.0 requires Umbraco.Cms.Web.Common (>= 13.0.0 && < 14.0.0) but version Umbraco.Cms.Web.Common 15.1.1 was resolved. I get an error in all the following cases: - Removing all references in the project file to Umbraco.Cms.Web.BackOffice / Umbraco.Cms.Web.Common - Only referencing Umbraco.Cms.Web.BackOffice - Referencing both Umbraco.Cms.Web.BackOffice / Umbraco.Cms.Web.Common Looked at removing all references to Umbraco.Cms.Web.BackOffice / Umbraco.Cms.Web.Common in code, but seems to be baked in, used for Models builder etc.

I'm now in the same situation, starting to upgrade from 13 to 15. Did you find a solution?

I didn’t I’m afraid

What if you manually set version 15.x in your .csproj files?

Umbraco.Cms.Web.BackOffice is not being published anymore. It has been removed from Umbraco. Hopefully you can remove the references to it in your own project and you should be good to go.

That's exactly what I did, I just removed the package so the error goes away. Obviously it will cause some errors in code that cuse the BackOffice package, but in my case it's mostly the notifications that don't exist anymore.