server keeps stopping at startup

[NinjaJake86]

Title: server keeps stopping at startup

Version: 3.1.2

OS: Mac OSX 10.6.8

Java Version: Dont know :/

Description of Problem:

server keeps stopping at this point in the code every time

Error Messages:

Error Log:

2013-01-20 18:03:25 [iNFO] Starting minecraft server version 1.2.5

2013-01-20 18:03:25 [iNFO] Attempting early MinecraftForge initialization

2013-01-20 18:03:25 [iNFO] Completed early MinecraftForge initialization

2013-01-20 18:03:25 [iNFO] Forge Mod Loader version 2.2.91.173 for Minecraft 1.2.5 loading

2013-01-20 18:03:25 [iNFO] Loading mods from /Users/turner/Minecraft/mods

2013-01-20 18:03:26 [WARNING] Failed to load mod class net/minecraft/server/mod_NetherOres.class in /Users/turner/Minecraft/mods/mod_NetherOres.jar

2013-01-20 18:03:26 [sEVERE] Zip file mod_NetherOres.jar failed to read properly

2013-01-20 18:03:26 [iNFO] File mod_NetherOres.jar contained no mods

2013-01-20 18:03:26 [iNFO] Directory weaponmod contained no mods

2013-01-20 18:03:26 [sEVERE] A problem has occured during mod loading. Likely a corrupt jar is located in your mods directory

2013-01-20 18:03:26 [sEVERE] cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.common.Loader.load(Loader.java:436)

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.common.Loader.loadMods(Loader.java:606)

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:134)

2013-01-20 18:03:26 [sEVERE] 	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:135)

2013-01-20 18:03:26 [sEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)

2013-01-20 18:03:26 [sEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

2013-01-20 18:03:26 [sEVERE] Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.common.Loader.loadModClass(Loader.java:527)

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:562)

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.common.Loader.load(Loader.java:419)

2013-01-20 18:03:26 [sEVERE] 	... 5 more

2013-01-20 18:03:26 [sEVERE] Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

2013-01-20 18:03:26 [sEVERE] 	at java.lang.ClassLoader.defineClass1(Native Method)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

2013-01-20 18:03:26 [sEVERE] 	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

2013-01-20 18:03:26 [sEVERE] 	at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

2013-01-20 18:03:26 [sEVERE] 	at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

2013-01-20 18:03:26 [sEVERE] 	at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

2013-01-20 18:03:26 [sEVERE] 	at java.security.AccessController.doPrivileged(Native Method)

2013-01-20 18:03:26 [sEVERE] 	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

2013-01-20 18:03:26 [sEVERE] 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:295)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.Class.forName0(Native Method)

2013-01-20 18:03:26 [sEVERE] 	at java.lang.Class.forName(Class.java:247)

2013-01-20 18:03:26 [sEVERE] 	at cpw.mods.fml.common.Loader.loadModClass(Loader.java:494)

2013-01-20 18:03:26 [sEVERE] 	... 7 more

2013-01-20 18:03:26 [sEVERE] Unexpected exception

cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

[NinjaJake86]

this problem has been identified as an issue with the version of java i am running, thanks for the help guys!