Mr_Fancy_Pants_

I tried to use Minecraft Forge Version 1.8.9 multiple times. I have downloaded it and deleted it and downloaded the reccomended and Latest versions. It keeps crashing and know what to do. The message it gives me is "The game crashed whilst there was a severe problem during mod loading that has caused the game to fail Error: net.minecraftforge.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/particle/Particle". I have increased the RAM to 4GB which is half of my PC's RAM supply. I also have another version of Vanilla 1.8.9 with multiple worlds on them. Any help would be appreciated.