[11:01:55 ERROR]: Could not pass event PlayerInteractEvent to Tkitpvp v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:297) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.craftbukkit.v1_8_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:209) [craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.craftbukkit.v1_8_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:176) [craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.craftbukkit.v1_8_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:172) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:653) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:50) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:80) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit.jar:git-Bukkit-33d5de3]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
        at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:656) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:609) [craftbukkit.jar:git-Bukkit-33d5de3]
        at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:517) [craftbukkit.jar:git-Bukkit-33d5de3]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.validate(CraftScheduler.java:395) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:123) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        at org.bukkit.scheduler.BukkitRunnable.runTaskTimer(BukkitRunnable.java:100) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        at br.com.kits.cooldown.add(cooldown.java:29) ~[?:?]
        at br.com.kits.KANGAROO.foguete(KANGAROO.java:33) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_121]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_121]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:295) ~[craftbukkit.jar:git-Bukkit-33d5de3]
        ... 17 more