How to become a Vassal developper

Okay have two versions of eclipse setup (EE & Java SE). Currently using Java SE and have svn setup correctly now and was able to svn down the src. I followed the instructions on the setting up eclipse page but something is still wrong.

My setup looks like:

dlazov - VASSAL
dlazov - ASL
CASL
VSQL

VASSAL is showing 38 errors with the first showing:
Access restrictions: The constructor AppletAudioClip(by…required library C:\Program Files\Java\jre6\lib\rt.jar

So that both the VASSAL & ASL are red X and the CASL & VSQL are red !

When I look in the Libraries folder for CASL ad VSQL it shows:

JRE System Library (JVM 15) (unbound).

Currently I have 1.6 and 1.7 JDK and JRE setup.

Any help would be appreciated.