[21:17:55] [Server thread/ERROR]: Could not pass event PlayerDeathEvent to BuildUHC v1.0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:396) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.EntityPlayer.die(EntityPlayer.java:417) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:812) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.EntityHuman.damageEntity(EntityHuman.java:800) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.EntityPlayer.damageEntity(EntityPlayer.java:496) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.EntityHuman.attack(EntityHuman.java:1001) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.EntityPlayer.attack(EntityPlayer.java:1063) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1355) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:52) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:11) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_72]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_72]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]
Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_7_R4/entity/CraftPlayer
	at eu.uprizing.spigotmc.Arena.onDeathWhileUnranked(Arena.java:169) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_72]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_72]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_72]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_72]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	... 22 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.craftbukkit.v1_7_R4.entity.CraftPlayer
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_72]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_72]
	at eu.uprizing.spigotmc.Arena.onDeathWhileUnranked(Arena.java:169) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_72]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_72]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_72]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_72]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	... 22 more
[21:17:56] [Server thread/WARN]: [BuildUHC] Task #302981 for BuildUHC v1.0 generated an exception
java.lang.NoClassDefFoundError: net/minecraft/server/v1_7_R4/PacketPlayInClientCommand
	at eu.uprizing.spigotmc.Arena$1.run(Arena.java:60) ~[?:?]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.9.jar:git-Spigot-db6de12-07c3001]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_72]