In the end , I found a solution about this problem. I was give up to continue after couple of days investigation on GGTS and decided to install Intellij 12 on mac. Installed trial licence for İntellij. I was expecting to avoid this problem. However I faced again an another wierd exception on İntellij. I had started to investigate current problem on intellij forums.
As a result,I found following advice to solve issue on intellij environment. The following instruction also solve my GGTS problem on mac.
Grails 2.3.0.RC1 and IntelliJ IDEA: "IDEA hook: Grails not found!"
it was referencing following solution also on stackoverflow.com
grails-2.3.0.M1 fails to start in IntelliJ IDEA 130.754
Solution : remove all "grails--2.3.0.M1-sources.jar" and "grails--2.3.0.M1-javadocs.jar" from $GRAILS_HOME/dist
Regards