2012-12-23 21:13:23 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.5-R0.2-b2488jnks (MC: 1.4.5) (Implementing API version 1.4.5-R0.2)
2012-12-23 21:13:24 [SEVERE] Could not load 'plugins\AngrySnowman.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: me/cybermaxke/angrysnowman/AngrySnowman : Unsupported major.minor version 51.0
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:154)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:227)
	at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:205)
	at net.minecraft.server.ServerConfigurationManagerAbstract.<init>(ServerConfigurationManagerAbstract.java:51)
	at net.minecraft.server.ServerConfigurationManager.<init>(SourceFile:11)
	at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:111)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:398)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.UnsupportedClassVersionError: me/cybermaxke/angrysnowman/AngrySnowman : 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.java:143)
	... 9 more