Holo api error

[21:41:55 WARN]: [HoloAPI] No such field: t!
[21:41:55 WARN]: [HoloAPI] Task #4346 for HoloAPI v1.2.3 generated an exception
java.lang.NullPointerException
>       at com.dsh105.holoapi.util.ReflectionUtil.setField(ReflectionUtil.java:114) ~[?:?]
>       at com.dsh105.holoapi.util.wrapper.protocol.Packet.write(Packet.java:84) ~[?:?]
>       at com.dsh105.holoapi.util.wrapper.WrapperPacketSpawnEntityLiving.setMetadata(WrapperPacketSpawnEntityLiving.java:130) ~[?:?]
>       at com.dsh105.holoapi.api.Hologram.generate(Hologram.java:755) ~[?:?]
>       at com.dsh105.holoapi.api.Hologram.show(Hologram.java:618) ~[?:?]
>       at com.dsh105.holoapi.api.Hologram.show(Hologram.java:587) ~[?:?]
>       at com.dsh105.holoapi.listeners.HoloListener$1.run(HoloListener.java:84) ~[?:?]
>       at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftTask.run(CraftTask.java:71) ~[craftbukkit.jar:git-Spigot-1554]
>       at org.bukkit.craftbukkit.v1_7_R4.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:346) [craftbukkit.jar:git-Spigot-1554]
>       at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:638) [craftbukkit.jar:git-Spigot-1554]
>       at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [craftbukkit.jar:git-Spigot-1554]
>       at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [craftbukkit.jar:git-Spigot-1554]
>       at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [craftbukkit.jar:git-Spigot-1554]
>       at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Spigot-1554]