Clearing the CacheDir value (I already had set the DefaultArtifactName to match a defined artifact) didn’t help in my case. I’m still getting an error when launching the packaged build and also when I try to reopen the project.
There is no default artifact in EOS (including ClientId etc.) that we can use for basic testing, like the “Spacewar” project on steam, right? Just to make sure, the issue is not caused by a bad project configuration or so.