Pixelmon Mod

Sorry I just dont know where to put this I am new to pixelmon I already downloaded the mod but it still crashes whenever I login I did everything step by step I uninstalled it then did it again same results. So I heard Optifine somehow is the problem I downloaded the newest version couple days ago but I still get the problems. If I delete Optifine will it make it work? Is Optifine really anything important?

shouldnt you post this in support? and optifine is said not to work with pixelmon so i dont know i really never tried optifine.