[20:24:22] [pool-3-thread-15/WARN]: Exception in thread "pool-3-thread-15"
[20:24:22] [pool-3-thread-15/WARN]: org.apache.commons.lang.UnhandledException: Plugin DrugSeller v1.0 generated an exception while executing task 4
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at org.bukkit.craftbukkit.v1_8_R1.CraftWorld.getEntitiesByClass(CraftWorld.java:654)
	at io.github.mac_genius.drugseller.NoMoving.run(NoMoving.java:32)
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:53)
	at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more