Read the thread where you got the script from.
It looks like you need to pick your own rock color and enter it into the script.
This little guide will show you how to do that:
http://villavu.com/forum/showthread.php?t=67793
Basically click the color dropper tool, click the rock on rs (pick a good/unique color), and then copy/paste the color from the Simba debug box into the script.
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