When I go to my media:ringtones and try to play a new tone I get the following error:

Unable to display file/Device Memory/samples/ringtones/Tune_Simple Times.mid

It does this on all files. Help?

Are these preloaded ring tones or new ones you've downloaded? Alse check this out to see if the files you are trying to place can be played on your BB. What kind of ringtones/audio can my Blackberry have? - BlackBerryFAQ

Hope it helps