[12:51:40] [Server thread/ERROR]: Could not pass event BlockPlaceEvent to fBossArena v1.0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[Myst.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[Myst.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:127) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.ItemStack.placeItem(ItemStack.java:158) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:503) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:759) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_221]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_221]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [Myst.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
Caused by: java.lang.NoClassDefFoundError: com/sk89q/worldedit/MaxChangedBlocksException
	at com.heroboss.boss.listener.BossListener.evento(r:72) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_221]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_221]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_221]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_221]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[Myst.jar:git-Spigot-21fe707-e1ebe52]
	... 18 more
Caused by: java.lang.ClassNotFoundException: com.sk89q.worldedit.MaxChangedBlocksException
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_221]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[Myst.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[Myst.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_221]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_221]
	at com.heroboss.boss.listener.BossListener.evento(r:72) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_221]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_221]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_221]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_221]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[Myst.jar:git-Spigot-21fe707-e1ebe52]
	... 18 more