How do I Build my game on Intel XDK?

i follow this tutorial scirra.com/tutorials/809/how-to-export-to-android-with-crosswalk but i can't build my game!!!! Intel XDK show me this "The build failed. An error occurred while building the application. Verify your build assets are correct and try again."

are you sure you are in the crosswalk tab when you add plugins settings and when you want to build your game ? because this tutorial work 100%