Macos Mojave: how to deal with corrupted bsd_flag in a private/var directory?
After further research I found out it's safe to delete some files in private/var/folders (please do your own research), so I cded to the folder and deleted the file via Terminal:

sudo rm fr.madrau.switchresx.app-559924946001.conf


Disk utility reports are clean. If my SwitchResX settings are messed up I can always re-install it or re-configure.