2013-07-01 12:58:48 [INFO] [STDOUT] IC2 Found...adding IC2 recipes for Assembly Line.
2013-07-01 12:58:48 [INFO] [STDERR] java.lang.NullPointerException
2013-07-01 12:58:48 [INFO] [STDERR] at net.minecraft.item.crafting.CraftingManager.func_92103_a(CraftingManager.java:213)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.registry.GameRegistry.addShapedRecipe(GameRegistry.java:244)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.registry.GameRegistry.addRecipe(GameRegistry.java:239)
2013-07-01 12:58:48 [INFO] [STDERR] at assemblyline.common.AssemblyLine.createIC2Recipes(AssemblyLine.java:293)
2013-07-01 12:58:48 [INFO] [STDERR] at assemblyline.common.AssemblyLine.load(AssemblyLine.java:200)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:494)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:192)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:172)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
2013-07-01 12:58:48 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:267)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:103)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
2013-07-01 12:58:48 [INFO] [STDERR] at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:213)
2013-07-01 12:58:48 [INFO] [STDERR] at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:448)
2013-07-01 12:58:48 [INFO] [STDERR] at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
2013-07-01 12:58:48 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:733)
2013-07-01 12:58:48 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)

Does this crash the game or are you getting this error while running Assembly Line without IC2. If its the second don't worry about it, but if its the first one next version is losing IC2 anyways.

It doesn't crash the game, and I am using the latest IC2. I get that error while everything is loading and all runs fine afterwards.

then don't worry about it too much. Its related to some old recipe hooks for IC2 that assembly line use to support. I've removed them so the next release will no longer have them. I might re-add them down to road but its not a big deal right now.