hi, i am trying to create a proxy server in Google App Engine using java but it always gives me error below

2013-01-26 20:39:27 Running command: "[u'C:\\Program Files (x86)\\Java\\jdk1.6.0_10\\bin\\java.exe', '-u', 'C:\\appengine-java-sdk-1.7.4\\appcfg.py', '--no_cookies', u'--email=email_id', '--passin', 'update', u'C:\\Proxy']"
Could not create the Java virtual machine.
Unrecognized option: -u
2013-01-26 20:39:27 (Process exited with code 1)

what is the problem i am not getting plz help