thats probably the problem, chances are the media player is looking for /dev/cdrom
add a symlink to it OR add an entry in your fstab file to it
you can test this before hand with a command line mp3 or music player like if your system is using alsa(probably is), try play /dev/hda and see what happens, if that works add a symlink to /dev/hda so whatever media player your using can find it, this is why your getting errors, its looking for a cdrom drive where there isnt one