Server Fails to Start

[Evilgiggle5]

Launcher/pack Version: 1.0.1.3

Operating System: Windows 7

Version of Java: v1.6.0_31

Description of Problem: Server will not start

Error Messages:

[sEVERE] Unexpected exception

java.lang.UnsupportedClassVersionError: net/minecraft/server/mod_IC2AdvancedMachines : Unsupported major.minor version 51.0

2012-05-24 15:25:51 [sEVERE] Unexpected exception

java.lang.RuntimeException: Exception occured in ModLoader

[sEVERE] Unexpected exception

java.lang.RuntimeException: ModLoader has failed to initialize.

Link to pastebin of log: http://pastebin.com/NcyQTFQx

[Backplague]

Get java 7.

[Evilgiggle5]

Thank you very much, server is now working perfectly.