[11:34:04] [Server thread/ERROR]: Could not pass event BlockPlaceEvent to EliteChallenges v1.0
org.bukkit.event.EventException: null
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:196) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.ItemStack.placeItem(ItemStack.java:209) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PlayerInteractManager.a(PlayerInteractManager.java:519) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1237) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PacketPlayInUseItem.a(PacketPlayInUseItem.java:37) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PacketPlayInUseItem.a(PacketPlayInUseItem.java:1) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_121]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_121]
	at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:896) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [spigot.jar:git-Spigot-f56e2e7-07e504c]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.lang.NoClassDefFoundError: com/sk89q/worldguard/bukkit/WGBukkit
	at me.bournedev.challenges.utils.Util.allowsPlacing(Util.java:164) ~[EliteChallenges-1.0-SNAPSHOT%20(1).jar:?]
	at me.bournedev.challenges.events.ChallengeListener.onBlockPlace(ChallengeListener.java:49) ~[EliteChallenges-1.0-SNAPSHOT%20(1).jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_121]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_121]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_121]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_121]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-f56e2e7-07e504c]
	... 18 more