org.bukkit.event.EventException: This exception has no message.

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org.bukkit.event.EventException:
at org.bukkit.craftbukkit.v1_10_R1.scoreboard.CraftObjective.checkState(CraftObjective.java:112)
at org.bukkit.craftbukkit.v1_10_R1.scoreboard.CraftObjective.unregister(CraftObjective.java:104)
at com.gmail.nossr50.util.scoreboards.ScoreboardWrapper.loadObjective(ScoreboardWrapper.java:374)
at com.gmail.nossr50.util.scoreboards.ScoreboardWrapper.setTypeSkill(ScoreboardWrapper.java:288)
at com.gmail.nossr50.util.scoreboards.ScoreboardManager.enablePlayerSkillLevelUpScoreboard(ScoreboardManager.java:258)
at com.gmail.nossr50.util.scoreboards.ScoreboardManager.handleLevelUp(ScoreboardManager.java:214)
at com.gmail.nossr50.listeners.SelfListener.onPlayerLevelUp(SelfListener.java:24)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
at com.gmail.nossr50.util.EventUtils.handleLevelChangeEvent(EventUtils.java:70)
at com.gmail.nossr50.datatypes.player.McMMOPlayer.checkXp(McMMOPlayer.java:503)
at com.gmail.nossr50.datatypes.player.McMMOPlayer.applyXpGain(McMMOPlayer.java:477)
at com.gmail.nossr50.datatypes.player.McMMOPlayer.beginUnsharedXpGain(McMMOPlayer.java:440)
at com.gmail.nossr50.datatypes.player.McMMOPlayer.beginXpGain(McMMOPlayer.java:430)
at com.gmail.nossr50.skills.SkillManager.applyXpGain(SkillManager.java:32)
at com.gmail.nossr50.skills.fishing.FishingManager.handleFishing(FishingManager.java:356)
at com.gmail.nossr50.listeners.PlayerListener.onPlayerFishMonitor(PlayerListener.java:283)
at sun.reflect.GeneratedMethodAccessor358.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
at net.minecraft.server.v1_10_R1.EntityFishingHook.j(EntityFishingHook.java:434)
at net.minecraft.server.v1_10_R1.ItemFishingRod.a(ItemFishingRod.java:17)
at net.minecraft.server.v1_10_R1.ItemStack.a(ItemStack.java:241)
at net.minecraft.server.v1_10_R1.PlayerInteractManager.a(PlayerInteractManager.java:387)
at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:956)
at net.minecraft.server.v1_10_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:27)
at net.minecraft.server.v1_10_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1)
at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)
at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:733)
at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:399)
at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:672)
at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:571)
at java.lang.Thread.run(Thread.java:745)

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