I was working on a small example app from the Outsystems Videos as I wanted to publish the solution so far.
However, a bunch of errors came up which seem to suggest the complete UserManagement is not installed?
I have attached an image of the errors that came up on publication.

What exactly is the problem here? What do I need to publish/install serverside that has not yet been installed, and, if so, how to do that?

Grateful for any assistance provided.

Best regards,
Issue resolved!
It proved, that the User solution was not published by/into the platform server. Did that manually and next thing was that the errors disappeared nicely....