I got this error when I try to load my single player world.
https://pastebin.com/6PnxR4bx

Here is my mod list: https://pastebin.com/rT4bydBT

I noticed that BiomeTweaker was disabled, but I don't know why.

Full fml-client-log-0: https://paste.ee/p/LuwOI

I have no idea what this... but it's also on 1.7.10 which is no longer supported.