Problem with digi002 Rack

I have quite a big problem: obviously Ardour won’t co-operate with my Digidesign digi002 rack, somehow. I have also an M-Audio Ozone Audio/MIDI-interface, which with jack seems to work ok (I haven’t tested it out other than that it worked to play a sound file in Ardour with that sound card). But through my digi002 rack, it doesn’t seem to work… I also get error messages, the latest one like this: [ERROR]: AudioEngine: cannot connect ardour:auditioner/out 1 (ardour:auditioner/out 1) to coreaudio:Built-in Audio:in1 (coreaudio:Built-in Audio:in1)
[ERROR]: AudioEngine: cannot connect ardour:auditioner/out 2 (ardour:auditioner/out 2) to coreaudio:Built-in Audio:in2 (coreaudio:Built-in Audio:in2)
I know that previous error messages have been a bit different, while there has been more lines (when I assigned more channels for use by the digi002).
By the way, I am running MacOSX 10.4.8, and JackOSX (Jackpilot)

Would be great if anyone knows anything about how fixing this…