Worklight 6.0 supports ONLY Eclipse for Jave EE Developers 4.2.2 ("Juno" SR2) or Eclipse Classic 4.2.2 ("Juno" SR2).
Worklight 6.0 will not work on prior versions of Eclipse.
Worklight 6.0 will not work on Eclipse 4.3 "Kepler" - there is no support for it, yet.