I'm not sure what problem your running into, I've just re-tested it in my Rocket Dock and it worked right away. Make sure you put the Folders into Rocket Dock Skins folder then pick the style in Rocket Dock settings.
i did exactly that. pasted the skin folders to the skin directory of rocketdock. Now when i go to dock settings and select this skin, it wont appear, it only shows the default skin. i downloaded it again just now but it still wont work for me, getting the same error
Hmmm Strange. I'm not sure what could be coursing that problem. Have you installed any other skins? I would download a skin from someone else on DA and check see if it's your Rocket Dock not coursing the problem. Not much i can do because it's working perfect on my side