@vxshelf hi there it seems that optifabric failed to download properly please follow these steps to fix the issue,
go to \.minecraft\ mods and delete optifine (if there isn't any you can skip this step)
go to \.minecraft\libraries\me\deftware\EMC-F-v2\latest-1.XX.X and delete optifabric (you can change the 1.XX.X into the version your using)
2,5. [OPTIONAL] navigate to \.minecraft\libraries\EMC\1.XX.X and delete optifine.jar
load up the game and go to a singleplayer world, wait for a message saying installing optifine please wait and restart the game once the notification finished installing (if you follow step 2,5 then install it again at the addon marketplace on the pause menu, wait for it to instruct you to restart then close the game properly DO NOT X THE GAME use the menu to exit the game avoiding any issues)
Mc version? Upload your config file (.minecraft/libraries/EMC/mcversion/configs/aristois_config) to pastebin and DM me the paste link. It's most likely you'll need to delete the config if it is corrupt.