Problem mit Minecraft Plugin

package main;import net.minecraft.server.v1_7_R1.World;import org.bukkit.Location;import org.bukkit.command.Command;import org.bukkit.command.CommandSender;import org.bukkit.entity.Player;import org.bukkit.plugin.java.JavaPlugin;public class teleport extends JavaPlugin{	@Override	public void onEnable(){		System.out.println("Teleport Plugin geladen.");	}	@Override	public void onDisable(){	}	@Override	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){		if(cmd.getName().equalsIgnoreCase("pvp")){			if(sender instanceof Player) {				Player p = (Player) sender;				if(args.length == 0){					World world = (World) p.getWorld();					new Location((org.bukkit.World) world,500,10,500);				}			}		}		return true;	}}

name: Teleportversion: 0.1author: Exod182main: main.teleport

[13:52:56] [Server thread/ERROR]: Could not load 'plugins\teleport.jar' in folder 'plugins'org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: main/teleport : Unsupported major.minor version 52.0	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:137) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:313) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:236) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.java:350) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at org.bukkit.craftbukkit.v1_7_R1.CraftServer.<init>(CraftServer.java:312) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at net.minecraft.server.v1_7_R1.PlayerList.<init>(PlayerList.java:63) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at net.minecraft.server.v1_7_R1.DedicatedPlayerList.<init>(SourceFile:14) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.java:126) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:424) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]Caused by: java.lang.UnsupportedClassVersionError: main/teleport : Unsupported major.minor version 52.0	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_71]	at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.7.0_71]	at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.7.0_71]	at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.7.0_71]	at java.net.URLClassLoader.access$100(Unknown Source) ~[?:1.7.0_71]	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_71]	at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.7.0_71]	at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_71]	at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.7.0_71]	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.7.0_71]	at java.lang.Class.forName0(Native Method) ~[?:1.7.0_71]	at java.lang.Class.forName(Unknown Source) ~[?:1.7.0_71]	at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:40) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:133) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]	... 9 more[13:52:56] [Server thread/INFO]: Preparing level "world"