Welp, here are the logs:

https://gist.github.com/vrork/9bd6a10e3211d32d80e14ba9b5964c0b

Caused by: java.lang.NoClassDefFoundError: Could not initialize class mod.chiselsandbits.chiseledblock.data.VoxelBlob

Seems like for some reason java is not finding the class, its certainly included in the mod, so there is no reason for that.

I'd suggest reducing mod count and seeing if the issue is caused by a second issue, or perhaps your java installation.

Tried both alredy. It keeps happening.

So you get the same error with just C&B and forge?

Strange, not getting it anymore... i was getting it last time i tested (i had this crash a few time on the past)

its a very unusual error that makes no sense, it would be different if that class was part of a another mod, or some library, but its part of C&B, and is most certainly in the mod.

If there are more mods a core mod might be causing problems, or like I said maybe there is an issue with java.

Shouldnt be a problem with Jave since it works without the rest of the mods. All the core mods are needed on the modpack, no extra ones, so i dont know. I will wait for some updates of other mods, maybe it fixes.

started getting this while testing 12.4 and 12.5 for #181

@APolarBaer thats very strange, your sure its related to the update in forge?

no thats why ive edited the post again lol

http://pastebin.com/FfJRDXxM

I still have no idea what would cause this, C&B includes that class, and theres nothing special about it. From what I have found online it seems that "Could not initialize class " indicates an issue with the class loader.

Which points to either a coremod, or forge failing that.

Common Mods:
-Advanced Rocketry -AppleSkin
-Aquaculture -Armory
-Armory Weaponry -AutoRegLib
-Baubles -BetterAchievements
-Biomes O Plenty -Blood Arsenal
-Blood Magic -BookshelfAPI
-Botania -Bullseye
-Chameleon -ChestTransporter
-Cooking for Blockheads -CraftTweaker
-Crossroads -Cyclops Core
-Elec Core -Ender Core
-EnderIO -Ender Tanks
-Ender Thing -Everlasting Abilities
-Evilcraft -Extra Alchemy
-Extra Utilities -Guide API
-Hopper Ducts -IC2
-InfernalMobs -Inventory tweaks
-JEI -Journeymap
-Just Enough Resources -LibVulpes
-Mantle -McJtyLib
-MCMultiPart -Morpheus
-Multistorage -Natura
-NetherCore -NoMoreRecipeConflict
-NotEnoughIDs -Open Computers
-OreDictionaryConverter -PackingTape
-Pams HC -Platforms
-PotionPacks -Progressive Automation
-Psi -Psionic Upgrades
-Railcraft -Reliquary
-RFTools -RFToolsControl
-RFToolsDimensions -Roots
-Realistic Terrain Generation -Shetiphiancore
-Simple Corn -Smithscore
-Steves Carts -Steves Factory Manager
-StorageDrawers -TConstruct
-TESLA -TinkerIO
-Tinkers Defense -Tinker Tool LEveling
-Waila -Waila Harvestability