poof! crashes.
crash-2017-07-10_21.44.37-client.txt

@HenrikoMagnifico that looks like the infamous milk bucket crash from MFR, can you disable milk buckets in MFR's config?

Try disabling parallel model baking.

What ? Can you give me this config please o.O ?

config/foamfix.cfg, experimental -> B:parallelModelBaking, set that to false

Okay, thank you :D
But ... is it likely to create RAM worries or not? Thank you anyway ! : D

No. Might make the game load 2-3 seconds slower, though.

Im using FTB Sky Factory 3 + some Mods Updated and some added to the Pack
With Foamfix 0.6.3 and even with 0.7.2 Anarchy and Lawful im Getting a client Load Crash with the same Error the OP reported.

Fun thing is, sometimes the Game start sometimes not and sometimes if i change some Settings in the Foamfix file it works again and then after aa Restart it wont for a few tries.

It Happens only if Foamfix is active, if i remove Foamfix it works.

I also changed Forge and ForgeChunkloading config files wich was stated on Your website under Tipps.
Also i changed the tip on this Github with the Experimental change to false for the Parrallel Model Baking. As i said alreads. Sometimes the Game starts without a crash and sometimes it wont start and crash while Baking the Models.

I tried disabling B:parallelModelBaking but it still crashed; https://pastebin.com/vc3gUwjA

I had the same problems. Since I disabled CodeChickenLib and CodeChickenCore and the mods that depend on them the crashes are gone.