[18:38:27 ERROR]: Could not load 'plugins\PProtect.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError
: me/PlutoniuMaster/bukkit/Main : Unsupported major.minor version 51.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:184) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:308) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:231) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.loadPlugins(CraftServer.ja
va:255) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.<init>(CraftServer.java:23
3) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.PlayerList.<init>(PlayerList.java:63) [c
raftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.DedicatedPlayerList.<init>(SourceFile:14
) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.init(DedicatedServer.jav
a:126) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:424) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
Caused by: java.lang.UnsupportedClassVersionError: me/PlutoniuMaster/bukkit/Main
 : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.6.0_23]
        at java.lang.ClassLoader.defineClassCond(Unknown Source) ~[?:1.6.0_23]
        at java.lang.ClassLoader.defineClass(Unknown Source) ~[?:1.6.0_23]
        at java.security.SecureClassLoader.defineClass(Unknown Source) ~[?:1.6.0
_23]
        at java.net.URLClassLoader.defineClass(Unknown Source) ~[?:1.6.0_23]
        at java.net.URLClassLoader.access$000(Unknown Source) ~[?:1.6.0_23]
        at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.6.0_23]
        at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_
23]
        at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.6.0_23]
        at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader
.java:80) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.
java:53) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.6.0_23]
        at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.6.0_23]
        at java.lang.Class.forName0(Native Method) ~[?:1.6.0_23]
        at java.lang.Class.forName(Unknown Source) ~[?:1.6.0_23]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:173) ~[craftbukkit-1.7.2-R0.2.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        ... 9 more