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Launcher/pack Version: Tekkit_Server_3.0.3 Operating System: Windows 7 64bit Version of Java: Java 6 Update 31 (64-bit); Java SE Development Kit 6 Update 31 (64-bit); Java 7 Update 4 Description of Problem: Server error appears when server starts. Error Messages: C:\TekkitServer3>java -Xmx3G -Xms2G -jar Tekkit.jar nogui 182 recipes 27 achievements 23:28:18 [iNFO] Starting minecraft server version 1.2.5 23:28:18 [iNFO] Forge Mod Loader version @MAJOR@.@MINOR@.@REV@.@BUILD@ for Minec raft @MCVERSION@ loading 23:28:18 [iNFO] Loading mods from C:\TekkitServer3\mods 23:28:18 [sEVERE] java.lang.UnsupportedClassVersionError: net/minecraft/server/m od_NetherOres : Unsupported major.minor version 51.0 23:28:18 [sEVERE] at java.lang.ClassLoader.defineClass1(Native Method) 23:28:18 [sEVERE] at java.lang.ClassLoader.defineClassCond(Unknown Source) 23:28:18 [sEVERE] at java.lang.ClassLoader.defineClass(Unknown Source) 23:28:18 [sEVERE] at java.security.SecureClassLoader.defineClass(Unknown S ource) 23:28:18 [sEVERE] at java.net.URLClassLoader.defineClass(Unknown Source) 23:28:18 [sEVERE] at java.net.URLClassLoader.access$000(Unknown Source) 23:28:18 [sEVERE] at java.net.URLClassLoader$1.run(Unknown Source) 23:28:18 [sEVERE] at java.security.AccessController.doPrivileged(Native Me thod) 23:28:18 [sEVERE] at java.net.URLClassLoader.findClass(Unknown Source) 23:28:18 [sEVERE] at java.lang.ClassLoader.loadClass(Unknown Source) 23:28:18 [sEVERE] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown So urce) 23:28:18 [sEVERE] at java.lang.ClassLoader.loadClass(Unknown Source) 23:28:18 [sEVERE] at java.lang.ClassLoader.loadClass(Unknown Source) 23:28:18 [sEVERE] at java.lang.Class.forName0(Native Method) 23:28:18 [sEVERE] at java.lang.Class.forName(Unknown Source) 23:28:18 [sEVERE] at cpw.mods.fml.common.Loader.loadModClass(Loader.java:4 40) 23:28:18 [sEVERE] at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.jav a:497) 23:28:18 [sEVERE] at cpw.mods.fml.common.Loader.load(Loader.java:375) 23:28:18 [sEVERE] at cpw.mods.fml.common.Loader.loadMods(Loader.java:527) 23:28:18 [sEVERE] at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBuk kitHandler.java:113) 23:28:18 [sEVERE] at net.minecraft.server.MinecraftServer.init(MinecraftSe rver.java:118) 23:28:18 [sEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftSer ver.java:426) 23:28:18 [sEVERE] at net.minecraft.server.ThreadServerApplication.run(Sour ceFile:492) 23:28:18 [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) > Link to pastebin of log: http://pastebin.com/ThvmHRAX