Gigantic error from CraftTweaker

[INITIALIZATION][CLIENT][ERROR] [crafttweaker]: Error executing {[0:crafttweaker]: Backpacks!\Recipes\Shaped.zs}: Bad type on operand stack
Exception Details:
  Location:
    Backpacks!_Recipes_.__script__()V @17: invokeinterface
  Reason:
    Type integer (current frame, stack[2]) is not assignable to 'java/lang/Object'
  Current Frame:
    bci: @17
    flags: { }
    locals: { }
    stack: { 'java/util/HashMap', 'java/util/HashMap', integer, 'crafttweaker/api/item/IItemStack' }
  Bytecode:
    0x0000000: bb00 0b59 b700 0e59 120f 1211 120f b800
    0x0000010: 17b9 001d 0300 5759 121e 1220 120f b800
    0x0000020: 17b9 001d 0300 5759 1221 1223 120f b800
    0x0000030: 17b9 001d 0300 5759 1224 1226 120f b800
    0x0000040: 17b9 001d 0300 5759 1227 1226 120f b800
    0x0000050: 17b9 001d 0300 5759 1228 1226 120f b800
    0x0000060: 17b9 001d 0300 5759 1229 1226 120f b800
    0x0000070: 17b9 001d 0300 5759 122a 1226 120f b800
    0x0000080: 17b9 001d 0300 5759 122b 1226 120f b800
    0x0000090: 17b9 001d 0300 5759 122c 1226 120f b800
    0x00000a0: 17b9 001d 0300 5759 122d 1226 120f b800
    0x00000b0: 17b9 001d 0300 5759 122e 1226 120f b800
    0x00000c0: 17b9 001d 0300 5759 122f 1226 120f b800
    0x00000d0: 17b9 001d 0300 5759 1230 1226 120f b800
    0x00000e0: 17b9 001d 0300 5759 1231 1226 120f b800
    0x00000f0: 17b9 001d 0300 574c bb00 3359 120f 1234
    0x0000100: b700 3759 b600 3b3e b600 3e2b 1db9 0042
    0x0000110: 0200 c000 44b9 0048 0100 b800 4e59 8403
    0x0000120: 011d a3ff e9a7 0003 57b1
  Stackmap Table:
    full_frame(@267,{Top,Object[#11],Top,Integer},{Integer})
    same_locals_1_stack_item_frame(@296,Integer)

java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    Backpacks!_Recipes_.__script__()V @17: invokeinterface
  Reason:
    Type integer (current frame, stack[2]) is not assignable to 'java/lang/Object'
  Current Frame:
    bci: @17
    flags: { }
    locals: { }
    stack: { 'java/util/HashMap', 'java/util/HashMap', integer, 'crafttweaker/api/item/IItemStack' }
  Bytecode:
    0x0000000: bb00 0b59 b700 0e59 120f 1211 120f b800
    0x0000010: 17b9 001d 0300 5759 121e 1220 120f b800
    0x0000020: 17b9 001d 0300 5759 1221 1223 120f b800
    0x0000030: 17b9 001d 0300 5759 1224 1226 120f b800
    0x0000040: 17b9 001d 0300 5759 1227 1226 120f b800
    0x0000050: 17b9 001d 0300 5759 1228 1226 120f b800
    0x0000060: 17b9 001d 0300 5759 1229 1226 120f b800
    0x0000070: 17b9 001d 0300 5759 122a 1226 120f b800
    0x0000080: 17b9 001d 0300 5759 122b 1226 120f b800
    0x0000090: 17b9 001d 0300 5759 122c 1226 120f b800
    0x00000a0: 17b9 001d 0300 5759 122d 1226 120f b800
    0x00000b0: 17b9 001d 0300 5759 122e 1226 120f b800
    0x00000c0: 17b9 001d 0300 5759 122f 1226 120f b800
    0x00000d0: 17b9 001d 0300 5759 1230 1226 120f b800
    0x00000e0: 17b9 001d 0300 5759 1231 1226 120f b800
    0x00000f0: 17b9 001d 0300 574c bb00 3359 120f 1234
    0x0000100: b700 3759 b600 3b3e b600 3e2b 1db9 0042
    0x0000110: 0200 c000 44b9 0048 0100 b800 4e59 8403
    0x0000120: 011d a3ff e9a7 0003 57b1
  Stackmap Table:
    full_frame(@267,{Top,Object[#11],Top,Integer},{Integer})
    same_locals_1_stack_item_frame(@296,Integer)

	at __ZenMain__.run(Backpacks!_Recipes_)
	at crafttweaker.runtime.CrTTweaker.loadScript(CrTTweaker.java:147)
	at crafttweaker.runtime.CrTTweaker.load(CrTTweaker.java:54)
	at crafttweaker.CrafttweakerImplementationAPI.load(CrafttweakerImplementationAPI.java:113)
	at crafttweaker.mc1120.events.CommonEventHandler.registerRecipes(CommonEventHandler.java:46)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_174_CommonEventHandler_registerRecipes_Register.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:143)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
	at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:746)
	at net.minecraftforge.common.crafting.CraftingHelper.loadRecipes(CraftingHelper.java:622)
	at net.minecraftforge.fml.common.Loader.initializeMods(Loader.java:717)
	at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:352)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:534)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
	at net.minecraft.client.main.Main.main(SourceFile:123)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)