So, I've got Forge 1.12.2 installed, and all that jazz. If I have no mods in the mods folder (Aside from mercurius and the 4 mods you have by default), Forge will run and work fine. If I have any other mods in the folder and open Forge from the Minecraft Launcher, it will do one of these, depending on the mod.
*Play normally, but the mod will not be in the game (Too Many Items)
or
*Crash while initializing the game (Decocraft)
or
*"An unexpected issue occurred and the game has crashed. We're sorry for the inconvenience." (Damage Indicator)
I don't know how to send crash reports or something, but if anyone knows what's going on, I'd really appreciate the help, since mods were the reason I got MC in the first place. Thanks!