I downloaded the most recent version of FTB Ultimine and added it to the mod directory. Before I added it the pack loaded just fine. After adding the mod the FTB Launcher hangs with no obvious errors. Log file attached.

console.log

ive added the mod and disabled music triggers due to some music bugs but i get no crash and if i check you log

i see
Caused by: java.lang.RuntimeException: java.lang.IllegalAccessError: class me.jellysquid.mods.lithium.common.shapes.VoxelShapeSimpleCube tried to access method
and i think you have lithium mod installed is that correct?

If lithium IS installed it wasn't done by me. Ultimine is the only extra mod I downloaded.

If i check the mod list i have i dont see lithium try disable it and check your mod list if any other mod dsables as well if so it was installed by that other mod that disables as well if not you can remove lithium savely

1. Try to disable both 'Its the little things' and 'Radium Reforged'
2. Launch the game with your newly added mods
3. it will show what the actual error is.

In my case it was a forge version error(a newer forge version was necessary)

Hope this helps