I have this problem, below is a screenshot. I also tried reinstalling minecraft, downgrading minecraft, upgrading minecraft, it just gives me this error. I also tried getting a fresh copy of minecraft on the minecraft.net site. Still it is like this. I was on Forge 1.7.10 when it first happened, and when I added the CodeChicken for Not Enough Items mod, this happened. I currently have 22 mods, but when I added those 2 mods, thats when it started occurring. It even occurs when I launch a non-modded minecraft client. What should I do?
No, and I tried restarting the computer and that worked! But thanks for trying!