when I tried to build my newest app, I first got an error about "mixed-line endings" in the build.settings. So, I copied a working build.settings from an older project and edited it again to create a new version of this file.
When I then tried to build, I still got an error with "More information may be available in the Simulator console". But this time, the console is showing no errors. :-(
Please see screenshot.
I am using Build 2018.3326.
It is really frustrating, because the main program code is the same than from most of my other apps - only some content files have changed.