Bukkit

What steps will reproduce the problem?
1. Placing a house sign on the a block.
2. Making sure there are 4 blocks of space above said block.
3. The sign works, but the other blocks don't appear above it.

What is the expected output? What do you see instead?
The expected output is to see the blocks appear above the sign according to the number of house points. The signs work, but they don't put any blocks above them.

What version of the product are you using? 1.1.0, but I am attempting to use it in a 1.9 server

Do you have an error log of what happened? Yes, but it happens every single time we award points to a house.

[15:30:33 ERROR]: Could not pass event PointsEvent to HousePoints v0.01
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[minecraft_server.jar:git-Bukkit-106ced0]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[minecraft_server.jar:git-Bukkit-106ced0]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [minecraft_server.jar:git-Bukkit-106ced0]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [minecraft_server.jar:git-Bukkit-106ced0]
    at com.knockturnmc.TheHousePoints.HousePoints.onCommand(HousePoints.java:123) [TheHousePoints-1.1.0-SNAPSHOT.jar:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [minecraft_server.jar:git-Bukkit-106ced0]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) [minecraft_server.jar:git-Bukkit-106ced0]
    at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchCommand(CraftServer.java:625) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.PlayerConnection.handleCommand(PlayerConnection.java:1297) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.PlayerConnection.a(PlayerConnection.java:1157) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(SourceFile:37) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.PacketPlayInChat.a(SourceFile:9) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Bukkit-106ced0]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_45]
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_45]
    at net.minecraft.server.v1_9_R2.SystemUtils.a(SourceFile:45) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:683) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:360) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:639) [minecraft_server.jar:git-Bukkit-106ced0]
    at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:543) [minecraft_server.jar:git-Bukkit-106ced0]
    at java.lang.Thread.run(Thread.java:744) [?:1.7.0_45]
Caused by: java.lang.NoClassDefFoundError: net/md_5/bungee/api/ChatColor
    at com.knockturnmc.TheHousePoints.PointsListener.changeHouseSign(PointsListener.java:85) ~[?:?]
    at com.knockturnmc.TheHousePoints.PointsListener.onPointsEvent(PointsListener.java:52) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_45]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_45]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_45]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_45]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[minecraft_server.jar:git-Bukkit-106ced0]
    ... 20 more

Please provide any additional information below.
Even though all of that warning language happens, points are still awarded. On the surface the plugin seems to be functioning normally, except for the blocks not appearing above the signs.