After Migrate Quickbuild from 3.0.10 to 5.1.12, I got a error as below.

I follow the documents (http://wiki.pmease.com/display/QB51/Upgrade+Data+And+Agent)
I migrated successfully with this command (D:\Server\Quickbuild-5.1.12\bin> migrate.bat D:\Server\quickbuild-3.0.10 )
After Starting Quickbuild new-version, I got error messages

D:\Server\quickbuild-5.1.12\bin>server.bat console
wrapper | --> Wrapper Started as Console
wrapper | Java Service Wrapper Standard Edition 32-bit 3.5.22
wrapper | Copyright (C) 1999-2013 Tanuki Software, Ltd. All Rights Reserved.
wrapper | http://wrapper.tanukisoftware.com
wrapper | Licensed to PMEase Inc. for QuickBuild
wrapper |
wrapper | Launching a JVM...
jvm 1 | WrapperManager: Initializing...
jvm 1 | WrapperStartStopApp Error: Class com.pmease.quickbuild.bootstrap.Bootstrap found but could not be initialized: java.lang.Unsuppor
tedClassVersionError: Bad version number in .class file
wrapper | JVM exited while loading the application.
wrapper | Reloading Wrapper configuration...
wrapper | Launching a JVM...
jvm 2 | WrapperManager: Initializing...
jvm 2 | WrapperStartStopApp Error: Class com.pmease.quickbuild.bootstrap.Bootstrap found but could not be initialized: java.lang.Unsuppor
tedClassVersionError: Bad version number in .class file
wrapper | JVM exited while loading the application.
wrapper | Reloading Wrapper configuration...
wrapper | Launching a JVM...
jvm 3 | WrapperManager: Initializing...
jvm 3 | WrapperStartStopApp Error: Class com.pmease.quickbuild.bootstrap.Bootstrap found but could not be initialized: java.lang.Unsuppor
tedClassVersionError: Bad version number in .class file
wrapper | JVM exited while loading the application.
wrapper | Reloading Wrapper configuration...
wrapper | Launching a JVM...
jvm 4 | WrapperManager: Initializing...
jvm 4 | WrapperStartStopApp Error: Class com.pmease.quickbuild.bootstrap.Bootstrap found but could not be initialized: java.lang.Unsuppor
tedClassVersionError: Bad version number in .class file
wrapper | JVM exited while loading the application.
wrapper | Reloading Wrapper configuration...
wrapper | Launching a JVM...
jvm 5 | WrapperManager: Initializing...
jvm 5 | WrapperStartStopApp Error: Class com.pmease.quickbuild.bootstrap.Bootstrap found but could not be initialized: java.lang.Unsuppor
tedClassVersionError: Bad version number in .class file
wrapper | JVM exited while loading the application.
wrapper | There were 5 failed launches in a row, each lasting less than 300 seconds. Giving up.
wrapper | There may be a configuration problem: please check the logs.
wrapper | <-- Wrapper Stopped