server problem

[mithcell r]

Launcher Version: 1.0.1.3

Operating System: windows 7

Java Version: 1.6.0_21

Antivirus Program: as soon as i extract the server to a blank folder and click start.bat it gets all the way to the code printed below and it immediatly stops

Description of Problem:

as soon as i extract the server to a blank folder and click start.bat it gets all the way to

Error Messages:

java.lang.unsupportedClassVersionerror: net/minecraft/server/mod_NetherOres : Unsupported major.minor version 51.0

Error Log:

[thebird]

I believe that means you need to install Java 1.7. Try that and don't forget to post your results here afterwords.