I have Worklight Developer 5.0.6 installed on Eclipse 4.2.2 (Juno).
Trying to deploy a plain-vanilla Worklight project (hybrid WL application created w/ Wizard), I get a pop-up window entitled Problem Occurred. The Details view shows this error message:
An internal error occurred during: "Start Worklight Server". 
org/apache/tools/ant/types/selectors/FileSelector
The Worklight Console in Eclipse shows this:
[2013-05-28 09:51:58]             Worklight Server started successfully on localhost:8080   
[2013-05-28 09:51:58]             Activating Worklight project: DemoAppProject...   
[2013-05-28 09:51:58]             Customization not found for project DemoAppProject. 
Building explicitly.
Checking the Worklight Console on http://localhost:8080/console I see that the server is running, but there's no active project.
What am I missing?