Wordpress Directory- "stylesheet is missing"

Wordpress Directory: error message "stylesheet is missing" after I upload.

I've spent an hour on this; download again, delete, install....

This is the only "theme" from WPMU Dev, or anyone else that gives me this problem.

I really need a solution fast.

- 30 minutes later...
Found the problem. It's not a theme; it's a plugin

I just assumed it was a theme since I searched it in the "Theme section". It's working fine as a plugin. Resolved...