system-config-printer-kde starts and gives me an error about interface KCModule

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http://forums.fedoraforum.org – I've been working on setting up a print server for my home network, it works great! I can print just fine using lpr, and can print from LibreOffice, but cannot print from other KDE applications like Firefox. I went to add a new printer using system-config-printer-kde, but get an error (see attached screenshot for detail) about KCModule not providing an interface. The printer is known to cups (set up using localhost:631), the cups service is running, i've tried 'yum downgrade system-config-printer-kde' to try an older version of the package, my laptop which runs fedora 16 runs the printer confi (HowTos)