I removed railcraft, and mods that gave the same error afterwards. It still doesn't work.
I've just been working on my own modpack which has 107 forge mods in right now. But if I open the control panel my game completely crashes. Just so you know, I have like 0 experience with putting modpacks together and API's and stuff...This is the crash report: https://pastebin.com/qQWsMVGp