ERROR: Error executing modDRPMedieval.zs: Bad type on operand stack
Exception Details:
  Location:
    ModDRPMedieval.__script__()V @628: ifnonnull
  Reason:
    Type integer (current frame, stack[4]) is not assignable to reference type
  Current Frame:
    bci: @628
    flags: { }
    locals: { top, '[Lstanhebben/zenscript/value/IAny;', top, '[Lstanhebben/zenscript/value/IAny;', top, '[Lstanhebben/zenscript/value/IAny;', top, '[Lstanhebben/zenscript/value/IAny;', top, top, integer, 'stanhebben/zenscript/value/IAny', top, 'stanhebben/zenscript/value/IAny', top, 'stanhebben/zenscript/value/IAny', top, 'stanhebben/zenscript/value/IAny' }
    stack: { '[Lstanhebben/zenscript/value/IAny;', 'minetweaker/api/recipes/IRecipeManager', 'stanhebben/zenscript/value/IAny', integer, integer }
  Bytecode:
    0x0000000: 120b b800 1112 12bd 0014 5912 1512 1712
    [...]
    0x0000640: 0d57 b1
  Stackmap Table:
    full_frame(@29,{},{Object[#105],Object[#105],Integer,Object[#71]})
    [...]
    full_frame(@1601,{Top,Object[#105],Top,Object[#105],Top,Object[#105],Top,Object[#105],Top,Top,Integer},{Object[#105]})

java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    ModDRPMedieval.__script__()V @628: ifnonnull
  Reason:
    Type integer (current frame, stack[4]) is not assignable to reference type
  Current Frame:
    bci: @628
    flags: { }
    locals: { top, '[Lstanhebben/zenscript/value/IAny;', top, '[Lstanhebben/zenscript/value/IAny;', top, '[Lstanhebben/zenscript/value/IAny;', top, '[Lstanhebben/zenscript/value/IAny;', top, top, integer, 'stanhebben/zenscript/value/IAny', top, 'stanhebben/zenscript/value/IAny', top, 'stanhebben/zenscript/value/IAny', top, 'stanhebben/zenscript/value/IAny' }
    stack: { '[Lstanhebben/zenscript/value/IAny;', 'minetweaker/api/recipes/IRecipeManager', 'stanhebben/zenscript/value/IAny', integer, integer }
  Bytecode:
    0x0000000: 120b b800 1112 12bd 0014 5912 1512 1712
	[...]
    0x0000640: 0d57 b1
  Stackmap Table:
    full_frame(@29,{},{Object[#105],Object[#105],Integer,Object[#71]})
    [...]
    full_frame(@1601,{Top,Object[#105],Top,Object[#105],Top,Object[#105],Top,Object[#105],Top,Top,Integer},{Object[#105]})

	at __ZenMain__.run(modDRPMedieval.zs)
	at minetweaker.runtime.MTTweaker.load(MTTweaker.java:161)
	at minetweaker.MineTweakerImplementationAPI.reload(MineTweakerImplementationAPI.java:682)
	at minetweaker.MineTweakerImplementationAPI$1.execute(MineTweakerImplementationAPI.java:75)
	at minetweaker.MineTweakerImplementationAPI$19.execute(MineTweakerImplementationAPI.java:667)
	at minetweaker.mc1102.server.MCServer$MCCommand.func_184881_a(MCServer.java:122)
	at net.minecraft.command.CommandHandler.func_175786_a(CommandHandler.java:104)
	at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:83)
	at net.minecraft.network.NetHandlerPlayServer.func_147361_d(NetHandlerPlayServer.java:913)
	at net.minecraft.network.NetHandlerPlayServer.func_147354_a(NetHandlerPlayServer.java:892)
	at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:37)
	at net.minecraft.network.play.client.CPacketChatMessage.func_148833_a(SourceFile:9)
	at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at net.minecraft.util.Util.func_181617_a(SourceFile:45)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:668)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:149)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
	at java.lang.Thread.run(Unknown Source)