For several weeks I have been ripping my CD collection to hard drive using Kubuntu 7.10 and KaudioCreator, I can no longer do this, when I click the Rip icon I now get the following error.

Could not start process Unable to create IO-slave
klauncher said: Unknown protocol ".

The problem seems to have started after I copied what I had already ripped onto DVD-RAM discs. I thought I had somehow wrecked my Kubuntu system so I did a complete new clean installation of my operating system this time with Ubuntu 7.10, I installed kaudiocreator and had exactly the same problem, I have thought to use Sound Juicer but I cannot set this up to use the same configuration, MP3/Artist/Track, that I had with kaudiocreator. I think the problem may be in my home directory because that has not been changed, but I don't know where to look.
Can someone please point me in the right direction,
Thanks,
Ralph.

Sounds like the audiocd slave is missing do you have

/usr/lib/kde3/audiocd.so and /usr/lib/kde3/audiocd.la

on your system?

If not then you might want to
apt-get install kdemultimedia-kio-plugins

If they are there check the device permissions. Presumming your cdrom is /dev/hdb (slave on second ide)

ls -l /dev/hdb

should come back with something like
brw-rw---- 1 root cdrom 3, 64 2008-02-07 18:25 /dev/hdb

This means the device is in the cdrom group, make sure you are a member by typing in groups

mine looks like:
username dialout cdrom floppy audio video netdev powerdev subversion

if cdrom isn't listed add it by

sudo adduser username cdrom

add try again.

Thank you for your reply Leonscape.
I have tried all your suggestions, I have two drives, one CD as /dev/hdd & one DVD as /dev/hdc, both are burners, both are in the cdrom group and I am a member of that group. I have also tried apt-get install kdemultimedia-kio-plugins and they were already installed, I still have the same error message, I can rip with Sound Juicer OK but I am having difficulties getting the Folder hierarchy the same as I used with KaudioCreator.
Thanks again,
Ralph.

Can you try accessing the cd with the kio slave directly?

Go into Konqueror and type

audiocd:/

in the address bar you should get a list of files, and some special folders. (These folders are for easy ripping and don't actually contain real files).

If not we might get a better error from konq we can work on.

thank you for your reply leonscape, I did as you suggested and finally managed to solve the problem, I have to confess it was of my own making, I ran konqueror from a terminal and discovered that kaudiocreator couldn't find its Default Temporary Directory, I had deleted it during a cleanup of my home partition earlier thinking it wasn't needed because it was empty, sorry about that, I have learnt a few things by following your suggestions, let's hope I learn from my mistakes as well. Thank you for all your help,
Ralph.

I had an identical problem with Grancha. I checked every file, permission and group that was suggested, and they seem to be fine.

This resulted in Konqueror error "An error occurred while loading audiocd:/:
Device doesn't have read permissions for this account. Check the read permissions on the device."

However, My Kaudiocreator also did not specify a temp folder. I made one and pointed it to that. Everything seems to work as usual now.

Thanks, everybody!