Lighting build failed

Hey guys, I need some help with building lighting.
It always fails and swarm logs said a cache file was occupied.


I tried to clean those cache files. I even uninstalled my engine and reinstalled it. But they all didn’t work.
Do you have any suggestions? Thanks a lot.

Have you tried to clean cache from Appdata/Local/UnrealEngine directory? Compiled shaders usually dumping up there.

Yep, took me so long to compile and initialize things again… and no use.

Now I’ve tried to alter the path of swarm cache folder. It didn’t work either.

微信图片_20230301144742
Some resolutions I find suggest to recompile this ‘Unreal Lightmass’. I didn’t find such file in UE5 root path. It seems like some module in source code. I’ve got Visual Studio in my computer but I don’t have such expertise. Maybe somebody knows this?
Thanks.

How do I compile lightmass? - #5 by anonymous_user_0ceb96a8 have you tried this?

No because I’m using launcher version of UE…
I’m not sure if I should download the source code version.