Was told to report this crash to this project instead.
Crashlog is here:
https://mclo.gs/IiUiuuS
In summary, loading the game in a modpack w/ Yung's Cave Biomes and Create 6.0.0 crashes the game upon attempting to start. I have also tried this with both Create 6.0.0 and Yung's Cave Biomes on a single instance with NOTHING else and get the same crash.