java.lang.UnsupportedClassVersionError: Bad version number in .class file HELP ME!!!!

[LuftWaffles]

I keep getting this error every time i try to launch Horizon java.lang.UnsupportedClassVersionError: Bad version number in .class file

It will give me an Error of Could not Find The main Class. Program will now Exit...If i see this error anymore im going to SCREAM...I've re-downloaded java I deleted my .minecraft and all data leading to minecraft (trouble shooting) and yet i cant figure this stoof out...could you guys help me?



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The FTB Launcher has found the following Java versions installed:
The FTB Launcher has found the following Java versions installed:
Java Path: C:\Program Files\Java\jre1.5.0_10\bin\javaw.exe
Setting MinMemory to 256
Setting MaxMemory to 1024
Defaulting PermSize to 256m
java.lang.UnsupportedClassVersionError: Bad version number in .class file <PROBLEM IN RED
at java.lang.ClassLoader.defineClass1(Native Method)
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$100(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.loadClassInternal(Unknown Source)

 

[Eyamaz]

You're running java 5... Update to 7.