I have the same problem. kscd is looking for /dev/cdrom which it says it can't access. The file is there, but it's zero bytes and owned by root. Permissions cannot be changed.

I did find another Linux CD player that worked, but it removed all (ALL) root access and I had to wipe the machine and start again. Not going to do that again!

I hear reports that Knoppix can't actually handle music CDs, so it's back to Windows for that.