Minecraft 1.7.10 Forge instantly closes

[Dec_bot]

So basically, I haven't modded Minecraft in years (literally) and I decided that I would try again. I installed Forge for Minecraft 1.7.10 (I tried Recommended and Latest) and both of them made the launcher close, then reopen with a giant error. I think this is because I've set it so Minecraft automatically reopens the launcher when it closes, so that means that the game is instantly crashing before any visuals come up.

The full error log is at: http://pastebin.com/9c3YatJu

[Choonster]

java.lang.NoClassDefFoundError: net/minecraftforge/fml/relauncher/IFMLLoadingPlugin

 

You're trying to use a coremod built for 1.8+ on a 1.7.10 client, this won't work.