Server will not start

[Pokechu22]

Title: Server will not start

Version: 3.0.3/3.0.4

OS: Windows 8 Release Preview with Media Center, 64 bit, Build 8400

Java Version: 1.5.0_31

Description of Problem:

The Tekkit server, version 3.0.4, will not run. I have 32 bit java, I think. I edited the batch file to this, because java could not reserve enough memory.

Batch file start:

java -Xmx1G -Xms500M -jar Tekkit.jar nogui

pause

:End of batch file

BTW, this also when my computer was running windows 7.

Error Messages:

No error message.

Error Log:

2012-06-24 14:02:57 [sEVERE] java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

2012-06-24 14:02:57 [sEVERE] 	at java.lang.ClassLoader.defineClass1(Native Method)

2012-06-24 14:02:57 [sEVERE] 	at java.lang.ClassLoader.defineClassCond(Unknown Source)

2012-06-24 14:02:57 [sEVERE] 	at java.lang.ClassLoader.defineClass(Unknown Source)

2012-06-24 14:02:57 [sEVERE] 	at java.security.SecureClassLoader.defineClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.net.URLClassLoader.defineClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.net.URLClassLoader.access$000(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.net.URLClassLoader$1.run(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.security.AccessController.doPrivileged(Native Method)

2012-06-24 14:02:58 [sEVERE] 	at java.net.URLClassLoader.findClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at java.lang.Class.forName0(Native Method)

2012-06-24 14:02:58 [sEVERE] 	at java.lang.Class.forName(Unknown Source)

2012-06-24 14:02:58 [sEVERE] 	at cpw.mods.fml.common.Loader.loadModClass(Loader.java:440)

2012-06-24 14:02:58 [sEVERE] 	at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:497)

2012-06-24 14:02:58 [sEVERE] 	at cpw.mods.fml.common.Loader.load(Loader.java:375)

2012-06-24 14:02:58 [sEVERE] 	at cpw.mods.fml.common.Loader.loadMods(Loader.java:527)

2012-06-24 14:02:58 [sEVERE] 	at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:113)

2012-06-24 14:02:58 [sEVERE] 	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:118)

2012-06-24 14:02:58 [sEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)

2012-06-24 14:02:58 [sEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

2012-06-24 14:02:58 [sEVERE] Unexpected exception

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

[Torezu]

This error is always the result of not using Java 7.