Multipart Crash

[11:10:50] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.VerifyError: Illegal type at constant pool entry 31 in class codechicken.multipart.scalatraits.TPartialOcclusionTile$class
Exception Details:
  Location:
    codechicken/multipart/scalatraits/TPartialOcclusionTile$class.occlusionTest(Lcodechicken/multipart/scalatraits/TPartialOcclusionTile;Lscala/collection/Seq;Lcodechicken/multipart/TMultiPart;)Z @24: invokeinterface
  Reason:
    Constant pool index 31 is invalid
  Bytecode:
    0000000: 2cc1 0009 9900 1e2a 2b2c b200 0fb6 0013
    0000010: b900 1903 00c0 0015 b900 1f02 009a 0005
    0000020: 03ac 2a2b 2cb9 0023 0300 ac
  Stackmap Table:
    same_frame(@34)

        at TileMultipart_cmp$$10.<init>(Unknown Source) ~[?:?]
        at TileMultipart_gen$$11.generate(Unknown Source) ~[?:?]
        at codechicken.multipart.asm.ASMMixinFactory$SuperSet.generate(ASMMixinFactory.scala:60) ~[ASMMixinFactory$SuperSet.class:?]
        at codechicken.multipart.asm.ASMMixinFactory$.generateTile(ASMMixinFactory.scala:310) ~[ASMMixinFactory$.class:?]
        at codechicken.multipart.MultipartGenerator$.addPart(MultipartGenerator.scala:94) ~[MultipartGenerator$.class:?]
        at codechicken.multipart.TileMultipart$.addPart(TileMultipart.scala:605) ~[TileMultipart$.class:?]
        at codechicken.microblock.AdditionPlacement.place(MicroblockPlacement.scala:24) ~[AdditionPlacement.class:?]
        at codechicken.microblock.ItemMicroPart.func_77648_a(ItemMicroPart.scala:73) ~[ItemMicroPart.class:?]
        at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:128) ~[add.class:?]
        at net.minecraft.server.management.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:389) ~[mx.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:554) ~[nh.class:?]
        at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60) ~[jo.class:?]
        at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9) ~[jo.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) ~[nc.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) ~[MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) ~[lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]