WP for Android ADT Problems

Hi,

I'm going through the process for customizing the WP for Android code, following the steps in the manual.

I've got to 'Compiling your app' on page 15, but when I click 'Run as> Android Application' I'm getting an error popup saying 'Android library projects cannot be launched', rather than the popup box I'm supposed to be getting.

Does anyone know why this could happen?