I have followed some of the following steps to enable subtheme of omega..
step1: I have downloaded Omega Base theme and enable it.. It worked fine..
step 2: I just copied the directory sites/all/themes/omega/omega to sites/all/themes/omega-new. Also Changed omega.info to omega-new.info.. Then, changed the files in the css folder.
step3: Now, After i went to my my sites Appearance, I can able to see two different themes such as omega and omega-new.
step4: Now, i selected omega-new as my default theme. Just refreshed the browser.. I can able to see, "HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request"
I also restarted apache but no solution. I pinged my hosting support and they told server is in active state..
Can somebody help why i'm getting this kind of error after enabling subtheme???