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Hello guys, I get this error while trying to run a tekkit 2.1.1 server on my mac: >Failed to load mod from "mod_IC2AdvancedMachines.class"

>java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:172)

at net.minecraft.server.ModLoader.readFromModFolder(ModLoader.java:929)

at net.minecraft.server.ModLoader.init(ModLoader.java:683)

at net.minecraft.server.ModLoader.Init(ModLoader.java:1357)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:102)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:411)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

23:21:55 [sEVERE] Unexpected exception

java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:172)

at net.minecraft.server.ModLoader.readFromModFolder(ModLoader.java:929)

at net.minecraft.server.ModLoader.init(ModLoader.java:683)

at net.minecraft.server.ModLoader.Init(ModLoader.java:1357)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:102)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:411)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

>java.lang.RuntimeException: Exception occured in ModLoader

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1292)

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1297)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:193)

at net.minecraft.server.ModLoader.readFromModFolder(ModLoader.java:929)

at net.minecraft.server.ModLoader.init(ModLoader.java:683)

at net.minecraft.server.ModLoader.Init(ModLoader.java:1357)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:102)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:411)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:172)

... 6 more

23:21:55 [sEVERE] Unexpected exception

java.lang.RuntimeException: Exception occured in ModLoader

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1292)

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1297)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:193)

at net.minecraft.server.ModLoader.readFromModFolder(ModLoader.java:929)

at net.minecraft.server.ModLoader.init(ModLoader.java:683)

at net.minecraft.server.ModLoader.Init(ModLoader.java:1357)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:102)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:411)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:172)

... 6 more

>java.lang.RuntimeException: ModLoader has failed to initialize.

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1292)

at net.minecraft.server.ModLoader.init(ModLoader.java:715)

at net.minecraft.server.ModLoader.Init(ModLoader.java:1357)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:102)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:411)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

Caused by: java.lang.RuntimeException: Exception occured in ModLoader

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1292)

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1297)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:193)

at net.minecraft.server.ModLoader.readFromModFolder(ModLoader.java:929)

at net.minecraft.server.ModLoader.init(ModLoader.java:683)

... 4 more

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:172)

... 6 more

23:21:55 [sEVERE] Unexpected exception

java.lang.RuntimeException: ModLoader has failed to initialize.

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1292)

at net.minecraft.server.ModLoader.init(ModLoader.java:715)

at net.minecraft.server.ModLoader.Init(ModLoader.java:1357)

at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:102)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:411)

at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

Caused by: java.lang.RuntimeException: Exception occured in ModLoader

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1292)

at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1297)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:193)

at net.minecraft.server.ModLoader.readFromModFolder(ModLoader.java:929)

at net.minecraft.server.ModLoader.init(ModLoader.java:683)

... 4 more

Caused by: java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)

at java.lang.ClassLoader.defineClass(ClassLoader.java:615)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)

at java.net.URLClassLoader.access$000(URLClassLoader.java:58)

at java.net.URLClassLoader$1.run(URLClassLoader.java:197)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

at net.minecraft.server.ModLoader.addMod(ModLoader.java:172)

... 6 more

Does somebody know what I can do to solve this problem?

Any help would be greatly appreciated :)

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