Error when running tekkit server

[SpyDaniel]

I'm getting these errors when I run the server, anyone know why?

C:\Users\Daniel\Desktop\Tekkit_Server_3.0.4>"C:\Program Files (x86)\Java\jre6\bi

n\java.exe" -Xmx1024M -Xms1024M -jar Tekkit.jar nogui

182 recipes

27 achievements

18:34:10 [iNFO] Starting minecraft server version 1.2.5

18:34:10 [iNFO] Forge Mod Loader version @MAJOR@.@MINOR@.@REV@.@BUILD@ for Minec

raft @MCVERSION@ loading

18:34:10 [iNFO] Loading mods from C:\Users\Daniel\Desktop\Tekkit_Server_3.0.4\mo

ds

18:34:10 [sEVERE] java.lang.UnsupportedClassVersionError: net/minecraft/server/m

od_NetherOres : Unsupported major.minor version 51.0

18:34:10 [sEVERE]      at java.lang.ClassLoader.defineClass1(Native Method)

18:34:10 [sEVERE]      at java.lang.ClassLoader.defineClassCond(Unknown Source)

 

18:34:10 [sEVERE]      at java.lang.ClassLoader.defineClass(Unknown Source)

18:34:10 [sEVERE]      at java.security.SecureClassLoader.defineClass(Unknown S

ource)

18:34:10 [sEVERE]      at java.net.URLClassLoader.defineClass(Unknown Source)

18:34:10 [sEVERE]      at java.net.URLClassLoader.access$000(Unknown Source)

18:34:10 [sEVERE]      at java.net.URLClassLoader$1.run(Unknown Source)

18:34:10 [sEVERE]      at java.security.AccessController.doPrivileged(Native Me

thod)

18:34:10 [sEVERE]      at java.net.URLClassLoader.findClass(Unknown Source)

18:34:10 [sEVERE]      at java.lang.ClassLoader.loadClass(Unknown Source)

18:34:10 [sEVERE]      at sun.misc.Launcher$AppClassLoader.loadClass(Unknown So

urce)

18:34:10 [sEVERE]      at java.lang.ClassLoader.loadClass(Unknown Source)

18:34:10 [sEVERE]      at java.lang.ClassLoader.loadClass(Unknown Source)

18:34:10 [sEVERE]      at java.lang.Class.forName0(Native Method)

18:34:10 [sEVERE]      at java.lang.Class.forName(Unknown Source)

18:34:10 [sEVERE]      at cpw.mods.fml.common.Loader.loadModClass(Loader.java:4

40)

18:34:10 [sEVERE]      at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.jav

a:497)

18:34:10 [sEVERE]      at cpw.mods.fml.common.Loader.load(Loader.java:375)

18:34:10 [sEVERE]      at cpw.mods.fml.common.Loader.loadMods(Loader.java:527)

18:34:10 [sEVERE]      at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBuk

kitHandler.java:113)

18:34:10 [sEVERE]      at net.minecraft.server.MinecraftServer.init(MinecraftSe

rver.java:118)

18:34:10 [sEVERE]      at net.minecraft.server.MinecraftServer.run(MinecraftSer

ver.java:426)

18:34:10 [sEVERE]      at net.minecraft.server.ThreadServerApplication.run(Sour

ceFile:492)

18:34:10 [sEVERE] Unexpected exception

java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Un

supported 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 java.lang.ClassLoader.loadClass(Unknown Source)

        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

        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 cpw.mods.fml.common.Loader.loadModClass(Loader.java:440)

        at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:497)

        at cpw.mods.fml.common.Loader.load(Loader.java:375)

        at cpw.mods.fml.common.Loader.loadMods(Loader.java:527)

        at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:

113)

        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:118)

        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)

        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

>

[SpyDaniel]

Fixed, had java 6 and 7 installed, removed 6 and it now works.