Abnormal Plugin Type?

Soo ive been making my kit plugin and i finally finished but i get a error when it tries to load on a server..

Code:

[17:12:28 ERROR]: Could not load 'plugins\FiberKits.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: Abnormal plugin type
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:56) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:127) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:328) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:251) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.loadPlugins(CraftServer.ja
va:355) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.reload(CraftServer.java:79
7) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.Bukkit.reload(Bukkit.java:288) [craftbukkit.jar:git-Bukkit
-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
0) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServe
r.java:701) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchServerCommand(Craf
tServer.java:688) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.aB(DedicatedServer.java:
296) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:2
61) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:5
58) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:469) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:6
28) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
Caused by: java.lang.InstantiationException: me.FiberSprite.FiberKits.FiberKits
        at java.lang.Class.newInstance(Unknown Source) ~[?:1.7.0_65]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:52) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        ... 15 more

Here is my FiberKits class

Code:java

package me.FiberSprite.FiberKits;
 
import java.io.File;
 
import me.FiberSprite.FiberKits.Commands.CommandManager;
import me.FiberSprite.FiberKits.Commands.Kits;
 
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.java.JavaPlugin;
 
public class FiberKits extends JavaPlugin
{
    public static FiberKits plugin;
 
    public File kits;
    public FileConfiguration ckits;
    public FiberKits instance;
 
    public FiberKits getInstance()
    {
        if (instance == null)
        {
            instance = new FiberKits(plugin);
        }
        return instance;
 
    }
 
    public FiberKits(FiberKits plugin)
    {
        this.plugin = plugin;
    }
 
    public void onEnable()
    {
        kits = new File(getDataFolder(), "kits.yml");
        ckits = YamlConfiguration.loadConfiguration(kits);
 
        CommandManager.getInstance();
 
        CommandManager.getInstance().addCommands(
                new Kits()
                );
    }
 
    public void onDisable()
    {
 
    }
 
    public void saveKits()
    {
        try
        {
            ckits.save(kits);
        }catch(Exception e)
        {
            e.printStackTrace();
        }
 
    }
}
 

 

FiberSprite Try removing line 30-33. Just for shits and giggles.

 

FiberSprite

What ferrago said, also stop making your members public. There's no reason to do so, and it's bad practice.

 

Code:java

 
public FiberKits getInstance() {
    return plugin;
}
 
public FiberKits() {
    this.plugin = plugin;
}
 

NEVER create your plugin again like you did on line 24! Also the constructor for your class takes no args.

 

Initialization occurs in the onEnable method, not upon instantiation.