Bukkit MineTP errors

Using MineTP v2.0:

2012-06-20 12:21:05 [INFO] This server is running CraftBukkit version git-Bukkit-1.2.5-R4
.0-b2222jnks (MC: 1.2.5) (Implementing API version 1.2.5-R4.0)
2012-06-20 12:21:06 [SEVERE] Could not load 'plugins/MineTP.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/xtr
source/minetp/MineTP : Unsupported major.minor version 51.0
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:151)
        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:213)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:189)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationMana
ger.java:53)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:166)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:432)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.UnsupportedClassVersionError: com/xtrsource/minetp/MineTP : Unsuppor
ted major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:247)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:140)
        ... 8 more

Using MineTP from github

2012-06-20 17:26:02 [INFO] Disconnecting raom [***.***.***.***:49343]:
Internal server error
2012-06-20 17:26:02 [WARNING] Failed to handle packet: java.lang.IllegalStateException: F
ailed to add player. net.minecraft.server.EntityPlayer@a3b198(raom at -70.47694118217328,
78.0,-515.4761317496257) already is in chunk -5, -33
java.lang.IllegalStateException: Failed to add player. net.minecraft.server.EntityPlayer@
a3b198(raom at -70.47694118217328,78.0,-515.4761317496257) already is in chunk -5, -33
        at net.minecraft.server.PlayerInstance.a(PlayerInstance.java:31)
        at net.minecraft.server.PlayerManager.addPlayer(PlayerManager.java:88)
        at net.minecraft.server.ServerConfigurationManager.c(ServerConfigurationManager.j
ava:143)
        at net.minecraft.server.NetLoginHandler.b(NetLoginHandler.java:129)
        at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:41)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:61)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)