Bukkit

Please give us a description of the problem:I get an error when reloading and loading the server saying cannot enable npc warehouse.[23:07:13 ERROR]: Error occurred while enabling NPCWarehouse v1.1.2 (Is it up to
date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R1/EntityHuman
        at net.npcwarehouse.NPCWarehouse.onEnable(NPCWarehouse.java:136) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:316) ~[c
raftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:324) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:404) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugin(CraftServer.jav
a:455) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.enablePlugins(CraftServer.
java:389) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.reload(CraftServer.java:83
9) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.Bukkit.reload(Bukkit.java:303) [craftbukkit.jar:git-Bukkit
-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
0) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServe
r.java:740) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchServerCommand(Craf
tServer.java:726) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at net.minecraft.server.v1_7_R4.DedicatedServer.aB(DedicatedServer.java:
294) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:2
59) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:5
58) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java
:469) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:6
28) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_7_R1.Entity
Human
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:67) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:62) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-16-g37c7969-b3105jnks]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_65]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_65]

What steps will reproduce the problem (What steps cause the problem)?
1.reloading server
2.starting server
3.typing /npc create

What version of NPCWarehouse are you using (If it is from the Jenkins server, please include the Build Number)?
v1.1.2

What version of Bukkit are you using?
craftbukkit.1.7.9

Do you have an error log of what happened?
above

Please provide any additional information below.
Anybody know a fix to this problem?