Crash report: http://pastebin.com/9y5PdJ0J

I've got @ReikaKalseki's statement on the question, which amounts to: "He is trying to access inventories that do not exist."

More specifically, the TileEntity is not an IInventory, the Container has no Slots, and yet the InvTweaks code started querying the contents of those nonexistent slots (likely assuming that the Container at least has a player inventory, which it does not).

java.lang.IndexOutOfBoundsException: Index: 44, Size: 44

There's certainly something in it. Autorefill in 1.7.10 is pretty broken in general though.

I can assure you there is not.