[18:30:58] [Server thread/INFO]: [Core] Enabling Core v1.0
[18:30:58] [Server thread/ERROR]: Error occurred while enabling Core v1.0 (Is it up to date?)
java.lang.UnsupportedClassVersionError: ua/lekting/main/commands/c_dwarn has been compiled by a more recent version of the Java Runtime (class file version 8244.8224), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_111]
	at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.8.0_111]
	at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.8.0_111]
	at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.8.0_111]
	at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.8.0_111]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_111]
	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_111]
	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_111]
	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_111]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:191) ~[Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:97) ~[Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111]
	at ua.lekting.main.Main.initializeConfiguration(Main.java:272) ~[?:?]
	at ua.lekting.main.Main.onEnable(Main.java:48) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:271) ~[Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.craftbukkit.v1_11_R1.CraftServer.enablePlugin(CraftServer.java:376) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at org.bukkit.craftbukkit.v1_11_R1.CraftServer.enablePlugins(CraftServer.java:326) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at net.minecraft.server.v1_11_R1.MinecraftServer.t(MinecraftServer.java:421) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at net.minecraft.server.v1_11_R1.MinecraftServer.l(MinecraftServer.java:382) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at net.minecraft.server.v1_11_R1.MinecraftServer.a(MinecraftServer.java:337) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at net.minecraft.server.v1_11_R1.DedicatedServer.init(DedicatedServer.java:272) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:544) [Spigot.jar:git-Spigot-3fb9445-2b6c9f4]
	at java.lang.Thread.run(Unknown Source)