Bukkit Server Printer Error

Hello,

I have a problem whit my bukkit server. When copy the printer bukkit files in the mods Folder then crashed the bukkit server.

it is teh printer v1.4 for bukkit

Error:

2012-08-16 19:00:15 [SEVERE] A problem has occured during mod loading. Likely a corrupt jar is located in your mods directory
2012-08-16 19:00:15 [SEVERE] cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_CCPrinter : Unsupported major.minor version 51.0
2012-08-16 19:00:15 [SEVERE]  at cpw.mods.fml.common.Loader.load(Loader.java:436)
2012-08-16 19:00:15 [SEVERE]  at cpw.mods.fml.common.Loader.loadMods(Loader.java:592)
2012-08-16 19:00:15 [SEVERE]  at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:132)
2012-08-16 19:00:15 [SEVERE]  at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:132)
2012-08-16 19:00:15 [SEVERE]  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
2012-08-16 19:00:15 [SEVERE]  at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-08-16 19:00:15 [SEVERE] Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_CCPrinter : Unsupported major.minor version 51.0
2012-08-16 19:00:15 [SEVERE]  at cpw.mods.fml.common.Loader.loadModClass(Loader.java:527)
2012-08-16 19:00:15 [SEVERE]  at cpw.mods.fml.common.Loader.attemptFileLoad(Loader.java:561)
2012-08-16 19:00:15 [SEVERE]  at cpw.mods.fml.common.Loader.load(Loader.java:419)
2012-08-16 19:00:15 [SEVERE]  ... 5 more
2012-08-16 19:00:16 [SEVERE] Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_CCPrinter : Unsupported major.minor version 51.0
2012-08-16 19:00:16 [SEVERE]  at java.lang.ClassLoader.defineClass1(Native Method)
2012-08-16 19:00:16 [SEVERE]  at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
2012-08-16 19:00:16 [SEVERE]  at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
2012-08-16 19:00:16 [SEVERE]  at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
2012-08-16 19:00:16 [SEVERE]  at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
2012-08-16 19:00:16 [SEVERE]  at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
2012-08-16 19:00:16 [SEVERE]  at java.security.AccessController.doPrivileged(Native Method)
2012-08-16 19:00:16 [SEVERE]  at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
2012-08-16 19:00:16 [SEVERE]  at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
2012-08-16 19:00:16 [SEVERE]  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
2012-08-16 19:00:16 [SEVERE]  at java.lang.ClassLoader.loadClass(ClassLoader.java:314)
2012-08-16 19:00:16 [SEVERE]  at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
2012-08-16 19:00:16 [SEVERE]  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
2012-08-16 19:00:16 [SEVERE]  at java.lang.Class.forName0(Native Method)
2012-08-16 19:00:16 [SEVERE]  at java.lang.Class.forName(Class.java:264)
2012-08-16 19:00:16 [SEVERE]  at cpw.mods.fml.common.Loader.loadModClass(Loader.java:494)
2012-08-16 19:00:16 [SEVERE]  ... 7 more
2012-08-16 19:00:16 [SEVERE] Unexpected exception
cpw.mods.fml.common.LoaderException: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_CCPrinter : 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:592)
at cpw.mods.fml.server.FMLBukkitHandler.onPreLoad(FMLBukkitHandler.java:132)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:132)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: cpw.mods.fml.common.LoaderException: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_CCPrinter : 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:561)
at cpw.mods.fml.common.Loader.load(Loader.java:419)
... 5 more
Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_CCPrinter : 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
2012-08-16 19:00:18 [INFO] Stopping server
2012-08-16 19:00:18 [SEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
2012-08-16 19:00:18 [SEVERE]  at java.util.ArrayList.rangeCheck(ArrayList.java:571)
2012-08-16 19:00:18 [SEVERE]  at java.util.ArrayList.get(ArrayList.java:349)
2012-08-16 19:00:18 [SEVERE]  at net.minecraft.server.MinecraftServer.stop(MinecraftServer.java:427)
2012-08-16 19:00:18 [SEVERE]  at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:500)
2012-08-16 19:00:18 [SEVERE]  at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2012-08-16 19:00:18 [INFO] Stopping server
2012-08-16 19:00:18 [SEVERE] Exception in thread "Thread-3"
2012-08-16 19:00:18 [SEVERE] java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
2012-08-16 19:00:18 [SEVERE]  at java.util.ArrayList.rangeCheck(ArrayList.java:571)
2012-08-16 19:00:18 [SEVERE]  at java.util.ArrayList.get(ArrayList.java:349)
2012-08-16 19:00:18 [SEVERE]  at net.minecraft.server.MinecraftServer.stop(MinecraftServer.java:427)
2012-08-16 19:00:18 [SEVERE]  at org.bukkit.craftbukkit.util.ServerShutdownThread.run(ServerShutdownThread.java:14)

edit: title

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

This means that the mod is compiled for Java 7, But the computer your running the server on doesn't have Java 7 installed, probably only Java 6,
So in other words you need to update your Java installation to Java 7 if you want to use this mod, Or get them to make a version targeting Java 6.

thank you tomass1996. It's going now.