elgg api for android application

hi elggers......
i saw many topic about elgg android application
example
http://community.elgg.org/discussion/view/1508884/android-application
http://community.elgg.org/discussion/view/1605330/elgg-android-app
http://community.elgg.org/discussion/view/1584519/elgg-android-application
but i still have doubt about elgg api....
I was trying this Elgg Android Application: https://github.com/josealopezpastor/ElggAndroidClient
but I am not able to logg into my account. I just get "Registration failure".
i try this
https://github.com/Tachyon/Elgg-Web-Services
and
https://github.com/ColdTrick/ws_pack
i also changed elggAndroidClient
/**Change URL and strablish the appropiate*/
public static final String MAIN_URL = "http://sitename.com";
what is wrong?????