help with android development

Unity Engine
1

i keep try to build and run a game i am developing for android but i keep getting this message

Error building Player: Exception: android (invokation failed)
ERROR: unknown error
cmd:android list target -c
stdout;
stderr:
Exception in thread “main” java.lang.NullPointerException
at SDKMain.main(SDKMain.java:62)

and anyone help

2

Current SDK version seems to be incompatible to Unity, see:
http://forum.unity3d.com/threads/183335-Android-build-error