Stylesheet Missing Error

When I upload any of the more “advanced” themes (by which I mean anything besides the basic eight or ten that are readily available when you first create your webpage), I consistently get the “stylesheet missing” error. I had this error with the basic eight or ten, but in those cases I was able to correct it simply by making sure I uploaded the folder inside the primary folder (if that makes sense), rather than the primary folder itself. However, that hasn’t helped in this case.

Is there something else I need to upload? If not, how can I correct this problem?