Could not find the main class

[mynoms]

Title: Could not find the main class

Version: 3.1.2

OS: Windows 7

Java Version: 6.0.240.7

Description of Problem:

This comes when i try to start Tekkit Classic

Error Messages:

Java Virtual Machine Launcher

Cuold not find the main class: net.technicpack.legacywrapper.Launch.

Program will exit.

Error Log:

Analytics Response [runModpack]: 200

 java.lang.UnsupportedClassVersionError: net/technicpack/legacywrapper/Launch : 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)

 Exception in thread "main"