there was a fatal error starting up minecraft and fml

this is the forgemodloader-cliant-0.log thing please help i really need this to work

2013-03-16 11:00:10 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.0.24.582 for Minecraft 1.5 loading

2013-03-16 11:00:10 [FINE] [ForgeModLoader] Enabling runtime deobfuscation

2013-03-16 11:00:10 [FINEST] [ForgeModLoader] All core mods are successfully located

2013-03-16 11:00:10 [FINEST] [ForgeModLoader] Discovering coremods

2013-03-16 11:00:10 [FINEST] [ForgeModLoader] Found a candidate coremod CodeChickenCore 0.8.4.jar

2013-03-16 11:00:10 [FINEST] [ForgeModLoader] Loading coremod CodeChickenCore 0.8.4.jar

2013-03-16 11:01:07 [iNFO] [sTDERR] Exception in thread "Thread-7" java.lang.RuntimeException: java.lang.UnsupportedClassVersionError: codechicken/core/asm/CodeChickenCorePlugin : Unsupported major.minor version 51.0

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:189)

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.relaunchApplet(FMLRelauncher.java:256)

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.appletEntry(FMLRelauncher.java:226)

2013-03-16 11:01:07 [iNFO] [sTDERR] at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)

2013-03-16 11:01:07 [iNFO] [sTDERR] at net.minecraft.Launcher.replace(Launcher.java:136)

2013-03-16 11:01:07 [iNFO] [sTDERR] at net.minecraft.Launcher$1.run(Launcher.java:79)

2013-03-16 11:01:07 [iNFO] [sTDERR] Caused by: java.lang.UnsupportedClassVersionError: codechicken/core/asm/CodeChickenCorePlugin : Unsupported major.minor version 51.0

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.ClassLoader.defineClass1(Native Method)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.ClassLoader.defineClassCond(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.ClassLoader.defineClass(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.security.SecureClassLoader.defineClass(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.net.URLClassLoader.defineClass(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.net.URLClassLoader.access$000(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.net.URLClassLoader$1.run(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.security.AccessController.doPrivileged(Native Method)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.net.URLClassLoader.findClass(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:133)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.ClassLoader.loadClass(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.Class.forName0(Native Method)

2013-03-16 11:01:07 [iNFO] [sTDERR] at java.lang.Class.forName(Unknown Source)

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.discoverCoreMods(RelaunchLibraryManager.java:408)

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:135)

2013-03-16 11:01:07 [iNFO] [sTDERR] at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:169)

2013-03-16 11:01:07 [iNFO] [sTDERR] ... 5 more