noob here, singleplayer terrain generation crash

[Thomas Olson]

Hello all,
I am new to this modpack and I wanted to try it on my own. My Minecraft is fully updated and my FTB launcher and Mindcrack ftb pack is fully updated as well (as of today). I logged in via the FTB launcher and started up the Mindcrack FTB and I selected single player-new world. The program managed to create a new world but it crashed when it was trying to generate terrain. I am going to post the error report below. Can anyone help me work through this issue?
thanks,
-Tommyolson2

 

[Nessiroj]

There is a problem with a chunkloader

java.lang.IllegalAccessError: tried to access field im.g from class codechicken.chunkloader.ChunkLoaderManager
at codechicken.chunkloader.ChunkLoaderManager.cleanChunks(ChunkLoaderManager.java:760)
at codechicken.chunkloader.ChunkLoaderManager.tickEnd(ChunkLoaderManager.java:789)

 

[Thomas Olson]

I tried reinstalling Minecraft and FTB from scratch and I noticed I don't have the problem before I run the recent FTB update it prompts me to. However after I apply the update I get the problem again any time I try to log onto my world.

 

[Thomas Olson]

do you have any suggestions for fixing this error?

 

[Thomas Olson]

Noone has responded in awhile, does anyone have any ideas yet?

 

[Nessiroj]

I have a feeling what the problem is (optifine B6), could you upload your console output to pastebin and link it here?