Board Thread:Modded Server Technical Support/@comment-69.179.180.186-20160823220413/@comment-27219153-20160823235022

I'm guessing you have played Minecraft 1.8+ recently. You may have set your render distance above 16 (a feature added in 1.8), and attempting to play 1.7.10 with an "invalid" render distance can cause this sort of crash. Try reducing all video settings to as minimal as possible before you create a world/join a server. If this doesn't work, I would recommend deleting your options.txt file in your .minecraft folder.