Hmm, when do you get the error? When trying to download or when you choose it in Clockwork?
Edit: just checked the file and it is still there so it should work. If you can't get it to work, another option is NexTheme which I actually like better than CleanBlack. It was released this weekend in a form that works on Froyo:
http://alldroid.org/tabid/62/g/posts...east-V0-1.aspx
I like it because the main theme is still black but it adds a LITTLE color. Not enough to be cheesy. Plus the icons are very nice. You install it the same way that I explained earlier.