Can't claim horses | Spigot 1.9.4

[nobodypromi]

Hello,
I can't claim horses. If i try it(with saddle on horse) there come just the default message:
"An internal error..."

Log:
[15:47:59 INFO]: Cassoss issued server command: /h claim
[15:47:59 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'h' in plugin mcMMOHorse v4.3.16
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[server.jar:git-Spigot-c6871e2-0cd0397]
at me.incomprehendable.dev.pwp.FakeSimpleCommandMap.dispatch(FakeSimpleCommandMap.java:98) ~[PerWorldPlugins%20(1).jar:?]
at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchCommand(CraftServer.java:646) ~[server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.PlayerConnection.handleCommand(PlayerConnection.java:1349) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.PlayerConnection.a(PlayerConnection.java:1184) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(PacketPlayInChat.java:1) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-Spigot-c6871e2-0cd0397]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_11]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_11]
at net.minecraft.server.v1_9_R2.SystemUtils.a(SourceFile:45) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:726) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665) [server.jar:git-Spigot-c6871e2-0cd0397]
at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564) [server.jar:git-Spigot-c6871e2-0cd0397]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_11]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/entity/AbstractHorse
at com.blueskullgames.horserpg.HorseRPG.claimHorse(HorseRPG.java:520) ~[mcMMOHorses.jar:?]
at com.blueskullgames.horserpg.HorseRPG.onCommand(HorseRPG.java:1576) ~[mcMMOHorses.jar:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Spigot-c6871e2-0cd0397]
... 15 more