Whats with the CD error message?

[spurite]

My wife has been driving her mini without being able to play CDs for a while now. When ever we put in a CD, it displays a "CD error" message. Is it because the lens that reads the CD is dirty, or is it because the CD playing mechanism is broken? I would really appreciate the help asap. My wife will be selling her car soon. Thank you in advance.

[bad venge]

I'd try running a disk cleaner CD first ... It cleans lense ECT