Error while building for android with and in JMonkeyEngine SDK 3.0

Hello, i just imported a project from eclipse and tried to use JMonkey SDK 3.0 to generate apk.
For that i followeed this tutoria here:

unfortunately, i’m having the following Error while building :

E:\MyProject\nbproject\mobile-impl.xml:33: The following error occurred while executing this line:
E:\MyProject\nbproject\mobile-impl.xml:42: Warning: Could not find resource file “E:\MyProject${}” to copy.

and i do not know how to valuate ${}

what i did wrong while building up the project ? Could you help me ?

Ok i just recreated th project from an empty directory (not imported from an eclipse project) redefined the project source and everything went well
Thanks anyway.