Fehler bei Lobby

[11:38:35 INFO]: [LB] Enabling Lobby v1.1.8
[11:38:35 ERROR]: Error occurred while enabling Lobby v1.1.8 (Is it up to date?)
java.lang.UnsupportedClassVersionError: me/BukkitPVP/Lobby/Config : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_111]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:803) ~[?:1.7.0_111]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.7.0_111]
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) ~[?:1.7.0_111]
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71) ~[?:1.7.0_111]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.7.0_111]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_111]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_111]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_111]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:195) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:97) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425) ~[?:1.7.0_111]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ~[?:1.7.0_111]
        at me.BukkitPVP.Lobby.Main.onEnable(Main.java:60) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Thread.java:745) [?:1.7.0_111]