My friends use to say the same thing about Tibia till they tried it
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18:21:29 [SEVERE] A problem has occured during mod loading. Likely a corrupt jar is located in your mods directory
18:21:29 [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
18:21:29 [SEVERE] at cpw.mods.fml.common.Loader.load(Loader.java:436)
18:21:29 [SEVERE] at cpw.mods.fml.common.Loader.loadMods(Loader.java:606)
18:21:29 [SEVERE] at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:134)
18:21:29 [SEVERE] at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:135)
18:21:29 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
18:21:29 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
18:21:29 [SEVERE] Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0
18:21:29 [SEVERE] at cpw.mods.fml.common.Loader.loadModClass(Loader.java:527)
18:21:29 [SEVERE] at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:562)
18:21:29 [SEVERE] at cpw.mods.fml.common.Loader.load(Loader.java:419)
18:21:29 [SEVERE] ... 5 more
18:21:29 [SEVERE] Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0
18:21:29 [SEVERE] at java.lang.ClassLoader.defineClass1(Native Method)
18:21:29 [SEVERE] at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
18:21:29 [SEVERE] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
18:21:29 [SEVERE] at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
18:21:29 [SEVERE] at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
18:21:29 [SEVERE] at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
18:21:29 [SEVERE] at java.security.AccessController.doPrivileged(Native Method)
18:21:29 [SEVERE] at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
18:21:29 [SEVERE] at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
18:21:29 [SEVERE] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
18:21:29 [SEVERE] at java.lang.ClassLoader.loadClass(ClassLoader.java:314)
18:21:29 [SEVERE] at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
18:21:29 [SEVERE] at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
18:21:29 [SEVERE] at java.lang.Class.forName0(Native Method)
18:21:29 [SEVERE] at java.lang.Class.forName(Class.java:264)
18:21:29 [SEVERE] at cpw.mods.fml.common.Loader.loadModClass(Loader.java:494)
18:21:29 [SEVERE] ... 7 more
18:21:29 [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
at cpw.mods.fml.common.Loader.load(Loader.java:436)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:606)
at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:134)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:135)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0
at cpw.mods.fml.common.Loader.loadModClass(Loader.java:527)
at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:562)
at cpw.mods.fml.common.Loader.load(Loader.java:419)
... 5 more
Caused by: 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.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:314)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at cpw.mods.fml.common.Loader.loadModClass(Loader.java:494)
... 7 more
It's the sphax purecraf(?).
Btw you should install tekkit!
Bukkit >> Tekkit
Tekkit is bukkit at it's core, in all honestly I would stick to the already mature bukkit. Tekkit depends on bukkit on matter of code, specially when bukkit makes a big code update!
@Znote
Stick to the trusty!