I'm not really into the modding scene in the same way.
my into the modding scene is like physics. It's completely theoretical knowledge.
E: Finally got the mods straightened out to not have ID conflicts... Generate a world, crash out.
E2: Greg, crash report, halp.
I'm no expert on logs so i'm not sure what is causing this but I think it might have to do with Biome Generation so try taking out any mods that add biomes and see if that fixes it.