Looks like the error came from forgelin, might want to check that mods comments/issue tracker to see if there is a known issue with that version. Also pretty sure 1.12 mc/forge is not supported on here anymore.
Read EAQ
I know we used to use splash.properties to change the colours of the loading text, bg, etc. As I'm making a pack in 1.16.1 I want to get rid of the eyesore colors currently being used but have yet to find a way how. Is it just not in yet?
I'm trying to determine the uses/purpose of the defaultconfigs folder as I run a server and have been unable to find anything on this. I realize it may be to terminology or just no one asking before.