Doesn't work with Cave&Cliffs: Backport

[gordrhain]

Hello there,
I have a modpack of 80 mods.This mod was working normally from the very beginning.(Also I really like the mod*-*)
When I install the Cave&Cliffs:Backport , I enter the game without any crashes. But this time the caves spawn in the classical way. When I remove the Cave&Cliffs:Backport, the problem goes away.Is there any way I can run both together?