FYI I got this crash updating pack.
http://pastebin.com/jz5R1bLJ

This should fix this too f593564

What version of BetterAgriculture are you using? And what version of Forge

Wake up knox, it's in the crash report:

Forge 12.17.0.1976
UCHE betteragriculture{0.16} Better Agriculture

Right -_-

Idk what this registry is doing there: (GameRegistry.addSmelting(ModBlocks.nethercoalOre, new ItemStack(Blocks.COAL_ORE, 2), 1.0f);)

It didn't crash on my end tho, we have been using on the public server.
Can you give more description about when does the crash happen?

Looks like that particular line is a leftover from nether metals and can go.

Found the mod it's conflicting with; RouterReborn. https://bitbucket.org/zyberwax/main/issues/54/nullpointer

i cant see how it is conflicting, i add a recipe to smelting, for coal ore to coal, but that should not cause any issues with nethercoalOre

im also able to load BetterAgriculture and RR together and im not getting a crash

Well darn, I didn't try it by themselves. Guess i gotta do it again with both installed and see who else could be the culprit.

Ok, so here are my findings, when I have both BA and RouterReborn installed, the game crashes on startup with the following mods as well:
AbyssalCraft
BaseMetals
Forestry
IC2

this is only happening if RR is installed?

when i tested BA + RR i noticed JEI is complaining there is a null item in the smelting recipes, this only happends when BA is installed, Does not cause a crash though.

Not sure how a null item ends up in there, but dont look like forge has any checks that prevent you from adding a null item, i need to test some more to make sure im not the one that add this null item, but i do check for null before i auto add recipes, so not sure what is going on here.

Yes happening when RR and BA are installed together along with the mods stated above.