org.bukkit.command.CommandException: Unhandled exception executing command 'npc'
 in plugin SenDServer v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[cus
tom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
0) ~[custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServe
r.java:703) ~[custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:955) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java
:817) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java
:28) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat
.java:47) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157
) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [cust
om.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:6
67) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
60) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
58) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [custom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R3.entity.C
raftVillager cannot be cast to me.iamguus.sendserver.nms.CustomVillager
        at me.iamguus.sendserver.npcs.NPCsUtil.spawnNPC(NPCsUtil.java:29) ~[?:?]

        at me.iamguus.sendserver.npcs.NPCsCommands.onCommand(NPCsCommands.java:2
9) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[cus
tom.jar:git-Bukkit-1.7.2-R0.3-56-g3779cff-b3072jnks]
        ... 13 more