Bukkit

What steps will reproduce the problem?
1. Run the plugin.

What is the expected output? What do you see instead?
No errors, I get errors.

What version of the product are you using?
v0.1.5

Do you have an error log of what happened?
The console is getting spammed wit this error:
<<code lua>>
[16:25:48 WARN]: Exception in thread "Craft Scheduler Thread - 1373"
[16:25:48 WARN]: org.apache.commons.lang.UnhandledException: Plugin FakePlayersOnline v0.1.5 generated an exception while executing task 45
    at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.NoClassDefFoundError: net/citizensnpcs/api/CitizensManager
    at me.fromgate.fakeplayersonline.FPOCitizens12x.getNPCList(FPOCitizens12x.java:35)
    at me.fromgate.fakeplayersonline.FakePlayersOnline.fillNPCList(FakePlayersOnline.java:198)
    at me.fromgate.fakeplayersonline.FakePlayersOnline$1.run(FakePlayersOnline.java:208)
    at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftTask.run(CraftTask.java:58)
    at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
    ... 3 more

<</code>>