Here's the big cheese:
I created a survival world because I was sick and tired of playing on creative mode. I got some new mods, and proceeded to create my world. I was searching for a mob from the Ice Cream Creeper Mod, and yet there were still normal creepers.
I exited the world, and took the mod out. After that, I tried to play on my survival again, but had a error which said, "FORGE HAS FOUND MISSING ID's" The screen then goes to the SHUTTING DOWN INTERNAL SERVER.
What should I do? Is this fixable? or do I have to keep my mods on, or otherwise delete the world?
Here is the crash log: