Every time I make a mod pack I will be faced with a red FML loading screen. once i'm in the actual game and have created a new world almost my entire world is filled with black and purple blocks minus from a few mods that appear every once and whether it be a biome or mobs. I have tried to delete and replace different mods but it never seems to work, i have even tried using only one mod in several occasions and it still seems to have this effect. I have tried also using connected textures mod and it was yet again a failure. Even default mine craft blocks are glitched except mobs.
what should I do?