Unsupportet major.minor version :/

Hello
I was edit Help plugin from other user but i have problem with plugin.yml

Code:

name: Pomoc
version: ??(i don't know)
main: sse.Pomoc.Pomoc

commands:
   pomoc:
      description: Wyswietla pomoc dla osadnikow.
      usage: /pomoc

What i do wrong ??

Pomoc.java

PHP:

package sse.Pomoc;
import java.io.*;
import java.util.ArrayList;
import org.bukkit.ChatColor;
import org.bukkit.command.*;
import org.bukkit.plugin.java.JavaPlugin;

public class Pomoc extends JavaPlugin {
    public ArrayList<String> message = new ArrayList<String>();
    public void log(Object input) {
        System.out.println("[POMOC] " + String.valueOf(input));
    }
    @Override
    public void onDisable() {
        log("Disabled");
    }
    @Override
    public void onEnable() {
        readPomoc();
        log("Enabled.");
    }
    public void readPomoc() {
        try {
            File pomoc = new File("pomoc.txt");
            if (!pomoc.exists())
                pomoc.createNewFile();
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    new DataInputStream(new FileInputStream(pomoc))));
            String strLine;
            while ((strLine = br.readLine()) != null) {
                message.add(strLine);
            }
            br.close();
            log("pomoc.txt read successfully!");
        } catch (Exception e) {
            log("pomoc.txt could not be read!");
        }
    }
    public boolean onCommand(CommandSender sender, Command cmd,
            String commandLabel, String[] args) {
        sender.sendMessage(ChatColor.AQUA+"--"+ChatColor.GREEN+"POMOC"+ChatColor.AQUA+"--");
        for(String m : message)
        sender.sendMessage(m);
        return true;
    }
}

This is error

Code:

17:10:08 [SEVERE] Could not load 'plugins\pomoc.jar' in folder 'plugins':
java.lang.UnsupportedClassVersionError: sse/Pomoc/Pomoc : Unsupported major.mino
r version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(Unknown Source)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:36)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:24)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:170)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:215)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:136)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:136)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:112)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigur
ationManager.java:52)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:136)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:348)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)

Thx for HELP :]

 

@piterrr70
you need to fill in the version with your version number. Any number should do.
not the problem i thought i was

 

I think the error is that you are compiling with another Java version than your server is running.
If you compile with Java 6, make sure you also run Java 6 and not Java 7 or vice versa.

 

THX @Bone008
I have installed java 6 and 7 and server run on 6, Eclipse compile with 7 :]

 

You may want to compile with 6. I recently tried releasing a 7 compile and was met with a host of people complaining.