RPGMobs Error

[17:48:45] [Server thread/INFO]: [ControllableMobsAPI] initialized by an unknown component
[17:48:45] [Server thread/ERROR]: Error occurred while enabling LorinthsRpgMobs v1.5.2 (Is it up to date?)
java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_6_R3/entity/CraftLivingEntity
	at de.ntcomputer.minecraft.controllablemobs.api.ControllableMobs.putUnderControl(ControllableMobs.java:258) ~[?:?]
	at de.ntcomputer.minecraft.controllablemobs.api.ControllableMobs.putUnderControl(ControllableMobs.java:242) ~[?:?]
	at de.ntcomputer.minecraft.controllablemobs.api.ControllableMobs.getOrPutUnderControl(ControllableMobs.java:211) ~[?:?]
	at me.Lorinth.MobDifficulty.MobSpawner.spawnEntity(MobSpawner.java:174) ~[?:?]
	at me.Lorinth.MobDifficulty.MobSpawner.startSpawn(MobSpawner.java:50) ~[?:?]
	at me.Lorinth.MobDifficulty.MobSpawner.create(MobSpawner.java:43) ~[?:?]
	at me.Lorinth.MobDifficulty.MobDifficulty.testMobSpawner(MobDifficulty.java:1726) ~[?:?]
	at me.Lorinth.MobDifficulty.MobDifficulty.onEnable(MobDifficulty.java:153) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:250) ~[custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:350) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:389) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugin(CraftServer.java:439) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.enablePlugins(CraftServer.java:375) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at net.minecraft.server.v1_7_R1.MinecraftServer.m(MinecraftServer.java:342) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at net.minecraft.server.v1_7_R1.MinecraftServer.g(MinecraftServer.java:319) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at net.minecraft.server.v1_7_R1.MinecraftServer.a(MinecraftServer.java:275) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:175) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:424) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_6_R3.entity.CraftLivingEntity
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:67) ~[custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[custom.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_21]
	... 19 more