I was going crazy trying to figure out why I couldn’t build modified content example maps with the correct post process settings for the rift, or any of my 3d models added. It would fail every time!
I usually would package because the framerate in rift mode is unbearable with the editor running in the background.
Well anyway, in the realistic rendering demo I could modify and package, but the content examples, effects cave, and a few others it would fail. So it looks like 4.3 and 4.4 have this packaging error, and it will be resolved in a future build. Just wanted to give some devs a heads up, as I was ready to throw out my computer.
Edit: Also, I just found out that before starting the editor you can right click your .uproject file and choose “launch”! Massive framerate increase for rift mode previewing without launching editor or having the package every time.
I gave that a shot, did the repair mode. Unfortunately that did not help. Some marketplace examples will package when modified, maybe you are trying one that actually works? It appears they are aware of the bug and a fix will come out in a later version. Probably not 4.4
Let me know if you can successfully package the Leveldesign_Workflow.umap example specifically (once making any modifications).