[15:03:53] [Server thread/ERROR]: Could not pass event BlockBreakEvent to FallingTrees v1.2.2
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[paperspigot-443.jar:git-PaperSpigot-443]
	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[paperspigot-443.jar:git-PaperSpigot-443]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[paperspigot-443.jar:git-PaperSpigot-443]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [paperspigot-443.jar:git-PaperSpigot-443]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.PlayerInteractManager.breakBlock(PlayerInteractManager.java:286) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.PlayerInteractManager.a(PlayerInteractManager.java:215) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:640) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockDig.a(SourceFile:40) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockDig.a(SourceFile:10) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [paperspigot-443.jar:git-PaperSpigot-443]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_92]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_92]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [paperspigot-443.jar:git-PaperSpigot-443]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [paperspigot-443.jar:git-PaperSpigot-443]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_92]
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source) ~[?:1.8.0_92]
	at java.util.ArrayList$Itr.next(Unknown Source) ~[?:1.8.0_92]
	at me.corperateraider.fallingtrees.TreeRunnable.<init>(TreeListener.java:229) ~[?:?]
	at me.corperateraider.fallingtrees.TreeListener.ini(TreeListener.java:55) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_92]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_92]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[paperspigot-443.jar:git-PaperSpigot-443]
	... 18 more