Google Developer Tools Java FATAL ERROR

Thanks in advance for your help.

I am new to the Google developer tools and I have been messing around trying to figure out how to get one of their features to work.

This one most specifically:

https://developers.google.com/appengine/docs/java/tools/eclipse#Running_the_Project

So this is how far I've gotten.

I updated my Java package to 1.7 . I installed the Google plug in for eclipse .,

I created a new project named " Guestbook ", made sure the boxes were checked, run->DebugAs-> WebApplication , and then I get this huge error :

Exception in thread "main" FATAL ERROR in native method: processing of -javaagent failed java.lang.UnsupportedClassVersionError: com/google/appengine/tools/development/agent/AppEngineDevAgent : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) 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 sun.instrument.Instrumentatio nImpl.loadClassAndStartAgent(InstrumentationImpl.java:280) at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:338)

I don't know what all this means.

I am still fairly new to java, so any help would be excellent.

Hope all is well

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