Bug Minecraft crashes before fully starting up.

[Turtle of Doom]

Playing infinity with animation api ,ars magica 2 , bkpkrs core, world save checkpoints, and thaumic horizons added.
log
http://pastebin.com/75WumpeV

 

[Whovian]

java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker

It's not finding the FML classes it's looking for. This probably means one of the mods you added was made for a version of Forge sufficiently different from the one that comes with Infinity. Make sure you're running versions of those mods for Minecraft version 1.7.10. If you are, either update Forge (can't say I really know how to do that; you might be able to try copying over all the mods to a MultiMC instance and choosing which version of Forge to run?) or try slightly older versions of the mods you added.

 

[Turtle of Doom]

Hmm doing a force update, and then re-adding all my mods seemed to do the trick, odd. Thanks and have a like for your time.