NBTEdit

2013-02-23 14:30:34 [INFO] Starting Minecraft server on *:25565
2013-02-23 14:30:34 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.7-R1.0-b2624jnks (MC: 1.4.7) (Implementing API version 1.4.7-R1.0)
2013-02-23 14:30:34 [SEVERE] Could not load 'plugins\NBTEdit.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/dethemium/sandbox/NBTEdit : Unsupported major.minor version 51.0
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:184)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)
	at org.bukkit.craftbukkit.v1_4_R1.CraftServer.loadPlugins(CraftServer.java:239)
	at org.bukkit.craftbukkit.v1_4_R1.CraftServer.<init>(CraftServer.java:217)
	at net.minecraft.server.v1_4_R1.PlayerList.<init>(PlayerList.java:55)
	at net.minecraft.server.v1_4_R1.DedicatedPlayerList.<init>(SourceFile:11)
	at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.java:104)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.UnsupportedClassVersionError: com/dethemium/sandbox/NBTEdit : 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.findClass0(PluginClassLoader.java:80)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
	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:173)
	... 9 more
2013-02-23 14:30:34 [INFO] Preparing level "world"
2013-02-23 14:30:34 [INFO] Preparing start region for level 0 (Seed: -5467958033173268577)
2013-02-23 14:30:35 [INFO] Preparing spawn area: 8%
2013-02-23 14:30:35 [WARNING] Could not get preferred channel details: SocketException
2013-02-23 14:30:36 [INFO] Preparing spawn area: 24%
2013-02-23 14:30:37 [INFO] Preparing spawn area: 36%
2013-02-23 14:30:38 [INFO] Preparing spawn area: 52%
2013-02-23 14:30:39 [INFO] Preparing spawn area: 65%
2013-02-23 14:30:41 [INFO] Preparing spawn area: 85%
2013-02-23 14:30:42 [INFO] Preparing start region for level 1 (Seed: -5467958033173268577)
2013-02-23 14:30:42 [INFO] Preparing spawn area: 0%
2013-02-23 14:30:42 [INFO] Preparing start region for level 2 (Seed: -5467958033173268577)
2013-02-23 14:30:43 [INFO] Preparing spawn area: 0%
2013-02-23 14:30:44 [INFO] Preparing spawn area: 40%
2013-02-23 14:30:45 [INFO] Preparing spawn area: 73%
2013-02-23 14:30:45 [INFO] Server permissions file permissions.yml is empty, ignoring it
2013-02-23 14:30:45 [INFO] Done (10.514s)! For help, type "help" or "?"