Deployment fails with 'An internal error occurred during: "Start Worklight Server"' - eclipse

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?

#bluez,
Based on your comments to my questions below,
I've installed Eclipse Classic 4.2.2 (Juno, on my Mac OS X 10.8.3) and Worklight Studio plug-in from the IBM website you've linked to.Created a new Worklight project and application. Build all and Deploy - deployment passed successfully.
Make sure that:
The "check for updates" checkbox is ticked before starting the plug-in installation.
You have Java JDK version 6 or later installed
Is this Eclipse Java EE 4.2.2 (Juno SR2), or another variant?
Does the project's .war file exist under the project's bin\ folder?
Is this a clean installation of Eclipse and Worklight plug-in, or an upgrade?
Try suggestions (from both the questions and anwers) from this question: Worklight fails to install customization jar

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