Sponge not showing up in Single player forge

i run a single player forge modded minecraft and can’t seem to run sponge or any plugins for it

If you put a link to the client log file, people can look at that and try to diagnose the problem.
A common issue arising when running SpongeForge with modpacks is outdated mixins.

OLDMIXIN FIX: A mod is loading an outdated Mixin version before Sponge, please report it to the mod author! For temporary solution rename the SpongeForge jar file, so its sorted alphabetically before the other mod e.g. rename spongeforge-1.12.2-2705-7.1.0-BETA-3318.jar to _aspongeforge-1.12.2-2705-7.1.0-BETA-3318.jar