Hey there,
Yesterday I started to make my own modpack for me and some friends and a YouTube project.
I can start and play the modpack in singleplayer with no problems, but when my friend is trying to play it, it won't load for him. His minecraft is closing and hes getting back to the launcher.
Mods: StatusEffectHUD, AnimationAPI, Baubles, BetterFps, ArsMagica, BloodMagic, Botania, CodeChickenCore, CoFHCore, extrautilities, fastcraft, jabba, Mantle, NEI, Optifine, TConsturct, Thaumcraft and witchery.
The Error hes getting can be found here.