21:17:37 [SEVERE] Could not load 'plugins\BattleKits (3).jar' in folder 'plugins
'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError
: com/lavacraftserver/BattleKits/BattleKits : Unsupported major.minor version 51
.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:154)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:305)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:230)
        at org.bukkit.craftbukkit.v1_4_5.CraftServer.loadPlugins(CraftServer.jav
a:227)
        at org.bukkit.craftbukkit.v1_4_5.CraftServer.<init>(CraftServer.java:205
)
        at net.minecraft.server.v1_4_5.ServerConfigurationManagerAbstract.<init>
(ServerConfigurationManagerAbstract.java:52)
        at net.minecraft.server.v1_4_5.ServerConfigurationManager.<init>(SourceF
ile:11)
        at net.minecraft.server.v1_4_5.DedicatedServer.init(DedicatedServer.java
:111)
        at net.minecraft.server.v1_4_5.MinecraftServer.run(MinecraftServer.java:
398)
        at net.minecraft.server.v1_4_5.ThreadServerApplication.run(SourceFile:85
6)
Caused by: java.lang.UnsupportedClassVersionError: com/lavacraftserver/BattleKit
s/BattleKits : Unsupported major.minor 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:44)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:29)
        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:143)
        ... 9 more