RLcraft server Sponge not working

I have a server running RLcraft modpack, and im trying to add Sponge forge yet it keeps crashing on me.LOG

The crash says exactly what went wrong and how to fix it.

net.minecraftforge.fml.common.MissingModsException: Mod phosphor-lighting (Phosphor Lighting Engine) requires [spongeforge@[1.12.2-2838-7.1.7-RC3844,)]