CustomPress install error: The theme is missing the style.css stylesheet.

First, CustomPress is not in the list above where it says "Select the theme this concerns"

Second, when I try to install CustomPress, I get the error: CustomPress install error: The theme is missing the style.css stylesheet.

By the way, I did check the .zip file and found that the style.css is not missing, but obviously it is on install that this error is happening.