Error

[22:36:19 INFO]: This server is running CraftBukkit version git-Bukkit-1.7.9-R0.
1-10-g8688bd4-b3092jnks (MC: 1.7.9) (Implementing API version 1.7.9-R0.2)
[22:36:20 ERROR]: Could not load 'plugins\TNTWars.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.ExceptionInInitializerError
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:131) ~[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.<init>(CraftServer.java:31
7) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.PlayerList.<init>(PlayerList.java:68) [c
raftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.DedicatedPlayerList.<init>(SourceFile:14
) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.DedicatedServer.init(DedicatedServer.jav
a:126) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java
:436) [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.ExceptionInInitializerError
        at me.junglesociety.tntwars2.TNTWars.<init>(TNTWars.java:39) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 ~[?:1.7.0_21]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:57) ~[?:1.7.0_21]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:45) ~[?:1.7.0_21]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:525) ~[?:1
.7.0_21]
        at java.lang.Class.newInstance0(Class.java:374) ~[?:1.7.0_21]
        at java.lang.Class.newInstance(Class.java:327) ~[?:1.7.0_21]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:52) ~[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]
        ... 9 more
Caused by: java.lang.IllegalArgumentException: Plugin already initialized!
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader
.java:98) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[craftb
ukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at me.junglesociety.tntwars2.TNTWars.<init>(TNTWars.java:16) ~[?:?]
        at me.junglesociety.tntwars2.ArenaManager.<init>(ArenaManager.java:31) ~
[?:?]
        at me.junglesociety.tntwars2.ArenaManager.<clinit>(ArenaManager.java:30)
 ~[?:?]
        at me.junglesociety.tntwars2.TNTWars.<init>(TNTWars.java:39) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 ~[?:1.7.0_21]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:57) ~[?:1.7.0_21]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:45) ~[?:1.7.0_21]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:525) ~[?:1
.7.0_21]
        at java.lang.Class.newInstance0(Class.java:374) ~[?:1.7.0_21]
        at java.lang.Class.newInstance(Class.java:327) ~[?:1.7.0_21]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:52) ~[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]
        ... 9 more
Caused by: java.lang.IllegalStateException: Initial initialization
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader
.java:101) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:66) ~[craftb
ukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
        at me.junglesociety.tntwars2.TNTWars.<init>(TNTWars.java:16) ~[?:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 ~[?:1.7.0_21]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:57) ~[?:1.7.0_21]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:45) ~[?:1.7.0_21]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:525) ~[?:1
.7.0_21]
        at java.lang.Class.newInstance0(Class.java:374) ~[?:1.7.0_21]
        at java.lang.Class.newInstance(Class.java:327) ~[?:1.7.0_21]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.jav
a:52) ~[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]
        ... 9 more