WAS 7.0 app will not start inside RAD 7.5

PROBLEM:

The following error message appears when a J2EE app is attempted for deployment-
A composition unit with name  already exists. Select a different application name.

RESOLUTION:

Delete the /blas and /cus directories for the bad application from the configuration.

The resources will be located in the config directory of the profile.:

/config/cells/qcell/blas
/config/cells/qcell/cus 

See the following URL for more details:

http://www-01.ibm.com/support/docview.wss?uid=swg21455322

Once the above directories are deleted, add projects to WAS Server inside RAD and then publish the application.

What edition of Eclipse ?

I use IBM's Rational Application Developer (RAD) as IDE. I know it is built on top of Eclipse platform. There are multiple versions of Eclipse - Europa(3.3), Ganymede(3.4), Galileo(3.5) and Helios (3.6).
How do I tell what version of Eclipse is my RAD built upon?
Within RAD, go to Help--> About RAD for WebSphere Software. Click on "Configuration Details" button at the bottom.

Save the configuration properties to a ".txt" file and search inside it for "org.eclipse.platform".
I have found an entry in mine -
org.eclipse.platform (3.4.2.R342_v20090122-9I96EiWElHi8lheoJKJIvhM3JfVsYbRrgVIWL) "Eclipse Platform"

From the above, I conclude that my RAD is based on Eclipse 3.4 or Ganymede platform.